1999MNRAS.310..210S

Query : 1999MNRAS.310..210S

1999MNRAS.310..210S - Mon. Not. R. Astron. Soc., 310, 210-222 (1999/November-3)

The stellar composition of the star formation region CMa R1 - I. Results from new photometric and spectroscopic classifications.

SHEVCHENKO V.S., EZHKOVA O.V., IBRAHIMOV M.A., VAN DEN ANCKER M.E. and TJIN A DJIE H.R.E.

Abstract (from CDS):

A new photometric and spectroscopic survey of the star formation region (SFR) CMa R1 is described. In a sample of 165 stars brighter than 13th mag, 88 stars were found to be probable members of the SFR. They are defined as early-type stars with E(B-V){ges}0.16mag, which corresponds to a distance of about 1kpc. 74 of the probable members are B stars. 19 stars are possibly associated with an IRAS point source. We derive a most probable distance of 1050±150pc to the association. It appears that about 80 candidate members are pre-main-sequence stars with ages lower than 6 million years, while the main sequence extends over 6.0-7.6mag, which is consistent with star formation starting about 8 million years ago and continuing until at least half a million years ago. Two bright B stars in the association (GU CMa and FZ CMa) seem to be much older and probably do not originate from the same star formation episode. The star formation efficiency appears to increase roughly monotonically with time up to half a million years ago. From our data, we conclude that only a minor fraction of the stars has been created through the scenario suggested by Herbst & Assousa, in which the members of CMa R1 form by compression of ambient material by a supernova shock wave. An extensive search for candidate members with Hα emission did not reveal new Herbig Ae/Be candidates, so that the number of stars in this class seems to be limited to four: Z CMa, LkHα 218, LkHα 220 and possibly HD 53367.

Abstract Copyright: 1999, Royal Astronomical Society

Journal keyword(s): circumstellar matter - stars: early-type - stars: evolution - stars: formation - stars: pre-main-sequence - open clusters and associations: individual: CMa R1

VizieR on-line data: <Available at CDS (J/MNRAS/310/210): table1 notes + MPG (Animations of association evolut ion)>

Nomenclature: Table 1: [SEI99] NNN (Nos 1-165).

Simbad objects: 169

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Number of rows : 169
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 [SEI99] 1 * 06 59 58.6610951280 -11 36 42.450924924   10.57 10.28     A5 1 0
2 HD 52271 ** 07 00 03.43979 -12 00 20.3356           B9IV 13 0
3 [SEI99] 3 * 07 00 05.0812652976 -11 32 05.788744584   11.30 11.21     A2 2 0
4 HD 52291 * 07 00 11.3874958488 -11 47 44.586439260   9.85 9.79     A0IV/V 4 0
5 HD 52314 * 07 00 17.8119583056 -11 43 32.153753280   9.60 9.45     A2III 4 0
6 [SEI99] 7 * 07 00 20.8330456944 -10 49 11.385802704   12.08 11.74     A8-F0 2 0
7 [SEI99] 8 * 07 00 23.0762380632 -10 53 27.161106396   11.96 11.74 11.81   A8 1 0
8 [SEI99] 6 * 07 00 24.1995620808 -12 04 25.128333336   11.77 11.45     A2-3 2 0
9 HD 52344 * 07 00 28.7757395352 -11 01 35.057837532   9.99 9.91     A2/5(IV) 4 0
10 [SEI99] 11 * 07 00 28.8001983096 -10 52 10.885399140   10.48 10.21     B9 1 0
11 HD 52386 * 07 00 31.8543330960 -11 27 30.826274544   10.41 10.15     A8V 4 0
12 [SEI99] 9 * 07 00 31.9744919688 -11 42 25.115933052   12.04 11.86 11.96   B6 1 0
13 [SEI99] 13 * 07 00 32.0120278512 -10 27 48.891926268   11.29 11.17     B9-A0 1 0
14 [SEI99] 15 * 07 00 35.0794565304 -11 11 31.329443040   10.95 10.89     A3 1 0
15 [SEI99] 14 * 07 00 35.9748542280 -11 44 13.712212212   11.20 11.11 11.24   A3 1 0
16 [SEI99] 19 * 07 00 38.1897987336 -10 51 25.169024520   11.53 11.19     B7-8 2 0
17 [SEI99] 16 * 07 00 38.2328855736 -12 12 38.455751160   11.57 12.07     A0 2 0
18 HD 52412 * 07 00 38.4740269848 -11 31 45.569731188   10.19 10.22     B5/7(III) 6 0
19 [SEI99] 17 * 07 00 38.4752937720 -12 10 07.017889512   11.72 11.10     A8 1 0
20 [SEI99] 20 * 07 00 38.7108395328 -10 52 32.215470528   11.68 11.20     B9 2 0
21 [SEI99] 21 * 07 00 39.0750177936 -10 34 42.268206000   12.11 11.55     B8-9 2 0
22 [SEI99] 23 * 07 00 44.8494797280 -10 57 22.154926464   11.33 11.21 11.49   B5-6 1 0
23 [SEI99] 22 * 07 00 45.2593124457 -11 16 34.393583228   10.48 10.17     F1-2 2 0
24 HD 52508 * 07 01 02.6253839592 -11 43 14.572771176   9.40 9.40     B9.5V 6 0
25 [SEI99] 25 * 07 01 07.7467270344 -11 24 04.234384836   11.04 10.89     A1-2 2 0
26 HD 52507 * 07 01 09.0016221816 -10 26 59.900820108   10.15 9.96     A3II/III 4 0
27 [SEI99] 26 * 07 01 12.6041636184 -11 28 33.762280116   10.55 10.13     F2 3 0
28 [SEI99] 28 * 07 01 15.1021502376 -11 03 47.103953256   10.18 10.01     B3 2 0
29 [SEI99] 29 * 07 01 18.6898225104 -11 41 32.350788312   10.41 10.38     A2-3 4 0
30 BD-10 1813 * 07 01 22.0771574112 -10 12 26.861400288   10.34 9.93     F5 2 0
31 TYC 5385-1636-1 * 07 01 23.0298254088 -10 47 41.159599584   11.03 10.78     B8 1 0
32 HD 52565 * 07 01 24.8554834632 -10 16 34.876395804   9.97 9.94     A1IV 6 0
33 [SEI99] 34 * 07 01 28.2201560160 -10 34 09.914689704   11.88 11.45     A3 2 0
34 HD 52641 * 07 01 29.6273099928 -12 19 44.066519976   9.08 8.91     A4IV 5 0
35 [SEI99] 35 * 07 01 35.4723231048 -11 41 16.719216000   10.60 10.12     F8 1 0
36 [SEI99] 36 * 07 01 38.1471820872 -12 09 11.297005596   11.96 11.61     F1 2 0
37 [SEI99] 37 * 07 01 42.6123122904 -11 53 59.502217632   11.06 11.17     A3 3 0
38 HD 52721 Ae* 07 01 49.50977 -11 18 03.3219 5.88 6.65 6.59 7.52   B2Vne 219 0
39 HRW 3 LP? 07 01 49.6566823992 -11 20 39.523694676   12.90 11.75     M4Ib-II 5 0
40 HD 52723 * 07 01 52.1301173448 -12 02 04.099072524   10.26 10.22     A1/2IV/V 7 0
41 [SEI99] 41 * 07 01 53.5102546512 -10 08 30.731908812   10.97 11.01     A2-3 1 0
42 HD 52746 * 07 01 58.0149869424 -12 10 51.107499336   9.76 9.66     B7II 4 0
43 [SEI99] 42 * 07 02 00.4270703784 -10 33 03.905700408   11.48 11.41     A2-3 2 0
44 [SEI99] 43 * 07 02 01.3547503392 -10 35 36.928451220   11.78 11.54     A8-F0: 2 0
45 [SEI99] 45 * 07 02 04.9939966248 -10 14 35.581451280   11.13 10.89     B9 2 0
46 HD 52773 * 07 02 05.1331333752 -11 04 49.894391712   9.90 9.83     A0V 5 0
47 [SEI99] 47 * 07 02 08.6300056344 -10 47 17.308548276   10.78 10.46     A8 1 0
48 HD 52774 * 07 02 08.7978036840 -11 10 05.747521008   8.83 8.82     A0/1IV 7 0
49 [SEI99] 50 * 07 02 11.1971355768 -10 15 47.526880392   10.53 10.48     B3 1 0
50 [SEI99] 49 * 07 02 11.8332129048 -10 36 14.577773904   10.43 10.32     B9 2 0
51 [SEI99] 51 * 07 02 13.2413438400 -10 35 23.128192140   10.79 10.66     A0-1 3 0
52 HD 52841 * 07 02 15.7952080296 -11 34 08.091899328   10.18 9.93     A8/9III 6 0
53 [SEI99] 52 * 07 02 23.8574848632 -11 49 41.077419096   11.46 10.98     B8-9 4 0
54 [SEI99] 55 ** 07 02 24.8 -10 17 37   11.35 11.02     B8-9 1 0
55 [SEI99] 54 * 07 02 26.5596469536 -11 01 58.234614204   11.62 11.48     F1 4 0
56 [SEI99] 53 * 07 02 26.8601028456 -11 12 25.266441708   11.07 10.96     A3 3 0
57 BD-09 1808 ** 07 02 30.51 -10 02 37.1   10.30 10.14     A0 1 0
58 [SEI99] 58 SB* 07 02 31.4033333664 -10 42 43.348666428   10.37 10.25     B9 1 0
59 HD 52891 * 07 02 34.3443502776 -10 04 23.869610796   9.54 9.05     F3V 6 0
60 [SEI99] 59 * 07 02 35.4143711016 -11 11 50.972467200   11.99 11.91     B8 1 0
61 [SEI99] 61 * 07 02 37.5574515096 -11 10 11.559496008   12.06 11.96     F0 3 0
62 [SEI99] 57 * 07 02 38.0901402024 -11 54 05.539103316   11.41 10.95     B7-8 1 0
63 BD-12 1748 * 07 02 38.6415005385 -12 14 01.581237720 10.27 10.48 10.23     B8III 12 1
64 [SEI99] 64 * 07 02 42.3887788152 -10 39 49.656113748   10.85 10.69     A1 2 0
65 EM* LkHA 218 Ae* 07 02 42.5309892768 -11 26 11.826714804   13 11.63     A0e 64 0
66 V* FZ CMa EB* 07 02 42.6143974968 -11 27 11.573934912 7.71 8.28 8.14     B2IVn 108 1
67 HD 52982 * 07 02 51.0179398320 -11 45 56.144891340   10.10 9.85     A2/3IV 8 0
68 HD 52967 * 07 02 52.9380754608 -10 45 08.238786804   9.90 9.95     B9V 7 0
69 [SEI99] 63 * 07 02 54.4636837608 -12 23 24.880975404   11.82 11.86     A3 2 0
70 HD 52966 * 07 02 54.6470689824 -10 21 21.626733528   9.32 8.86     F3IV/V 6 0
71 HD 53011 * 07 02 57.6568717368 -11 58 10.560121860   10.31 10.19     A1III/IV 7 0
72 ATO J105.7460-11.4571 V* 07 02 59.0585584104 -11 27 25.798400748 11.21 11.58 11.17 11.16   B2V 12 0
73 HD 53010 EB* 07 03 02.2506362640 -11 07 01.646403492   8.93 8.92     B3IV 23 0
74 [SEI99] 71 * 07 03 06.9668262912 -11 38 30.253575948   13.69 13.01 12.89   ~ 1 0
75 HD 53035 * 07 03 07.7710036368 -11 11 57.015532068 7.24 7.81 7.88     B3/5III 33 0
76 HRW 7 * 07 03 10.7757177864 -11 38 28.654634688 10.38 10.76 10.64     B3III-IV 7 0
77 [SEI99] 74 * 07 03 11.4555616608 -11 25 38.931783960   10.38 10.26     A3 2 0
78 [SEI99] 75 * 07 03 11.6041411584 -11 18 57.360214224   12.37 12.09 12.13   F0 2 0
79 HD 53060 * 07 03 14.2034594904 -11 08 14.673589908   8.03 7.99     A0IV/V 19 0
80 [SEI99] 77 * 07 03 19.5191285208 -11 23 28.291121304   11.73 11.58     B3 6 0
81 [SEI99] 78 * 07 03 20.5636458384 -10 55 53.103764604   11.16 10.87     B2 4 0
82 BD-10 1839 EB* 07 03 24.5579992272 -10 42 16.333231176 9.81 10.12 9.76     B2Vn 28 1
83 LS 137 * 07 03 34.6011797592 -11 44 55.358743776   11.19 10.52 10.39   B0 9 0
84 [SEI99] 83 * 07 03 36.3158378184 -11 06 06.562421784   12.55 12.21     F0-1 2 0
85 HD 53159 ** 07 03 37.3494890586 -10 31 20.339174954   9.57 9.27     F0V 4 0
86 [SEI99] 86 * 07 03 39.2328516672 -10 26 12.777177372   11.29 10.89     B9-A0 3 0
87 [SEI99] 82 * 07 03 39.6146946864 -11 31 52.667904252   11.63 11.55     B8 4 0
88 [SEI99] 81 * 07 03 39.7485920664 -11 49 36.942348756   10.56 10.45     B9 2 0
89 [SEI99] 84 * 07 03 40.6372373040 -11 23 31.406048556   11.69 11.51     A 7 0
90 V* Z CMa Ae* 07 03 43.1599411656 -11 33 06.209065836 10.51 9.99 8.80     B5/8eq+F5/7 578 3
91 HRW 10 * 07 03 46.5163372872 -11 03 46.087568172   13.29 12.84 12.78   ~ 4 0
92 [SEI99] 88 * 07 03 49.8143727288 -11 28 22.450330200   11.76 11.18     ~ 2 0
93 BD-11 1761 * 07 03 52.4970988152 -11 34 51.858995628 8.83 9.32 9.25     B2V 24 0
94 [SEI99] 90 Y*O 07 03 53.4967744680 -11 23 50.702237448 10.97 10.75 10.53 10.78   A0 4 0
95 BD-11 1762 * 07 03 54.4249106064 -11 28 29.388376380 9.6 10.14 10.05     B2IV-Vn 25 0
96 [SEI99] 93 * 07 03 54.8437313856 -11 33 41.300756172   10.22 10.13 10.23   ~ 2 0
97 BD-11 1763 Y*O 07 03 54.8581618368 -11 34 34.077428004   9.52 9.53 9.60 9.12 B1.5V 27 0
98 [SEI99] 96 * 07 03 56.3467898448 -10 46 16.205593980   11.65 12.10     A8 2 0
99 HRW 14 * 07 03 56.8412699400 -11 34 41.748620592 12.57 12.66 12.07 12.03   B7III 11 0
100 [SEI99] 95 Y*O 07 03 58.8046021608 -11 35 31.169705496   11.17 11.51 11.42 10.97 B2-3 8 0
101 [SEI99] 98 * 07 03 59.1534465312 -11 03 17.030343276   11.35 11.31     F2 4 0
102 BD-10 1845 * 07 03 59.2023079608 -11 11 58.973903304   10.42 10.29     B4V 5 0
103 [SEI99] 105 * 07 03 59.8592028216 -10 30 23.721393348   10.63 10.51     B7 4 0
104 [SEI99] 101 * 07 04 00.7342601184 -11 00 04.132011204   11.24 11.06     B6-8 4 0
105 [SEI99] 99 Y*O 07 04 02.3423371488 -11 25 39.379536660 10.23 10.69 10.74 10.8 10.38 B3-5 10 0
106 [SEI99] 100 * 07 04 02.8388916432 -11 32 15.558031392   11.90 11.69 11.81   B8-9 3 0
107 [SEI99] 104 * 07 04 03.4211060568 -11 10 04.336196988   12.22 11.47     F5-8 3 0
108 [SEI99] 102 Y*O 07 04 03.9364302408 -11 26 09.795240096 9.45 10.08 10.16 9.78 9.74 ~ 6 0
109 [SEI99] 106 * 07 04 04.2295385040 -10 54 42.861026196   11.72 11.40     F5 3 0
110 BD-11 1765 Y*O 07 04 05.4222635808 -11 28 56.189526276   10.32 10.21 11.39 10.06 B2 7 0
111 EM* LkHA 220 Ae* 07 04 06.7000977696 -11 26 08.505214800   11.62 11.60     B8e 58 0
112 HRW 16 * 07 04 07.5059676768 -11 18 56.994812460   11.62 11.08 11.20   B5Vn 6 0
113 [SEI99] 110 * 07 04 09.0692546616 -11 05 16.568935584   10.59 10.40     A5 2 0
114 HD 53302 SB* 07 04 09.4395326952 -10 16 57.468463824   8.40 8.18     A3III 7 0
115 [SEI99] 109 * 07 04 09.7978120152 -11 32 53.847741552   11.80 12.28     A8 2 0
116 [SEI99] 108 * 07 04 13.0609594584 -12 10 20.769746376   11.13 11.15     B6-8 5 0
117 HRW 17 * 07 04 13.2331967610 -11 19 00.978079322 11.78 12.11 11.83     B8II 9 0
118 [SEI99] 115 * 07 04 15.0033779232 -11 06 56.833251120   11.93 11.68     A5 3 0
119 BD-10 1847 * 07 04 15.7680974112 -10 34 31.276413804   10.43 10.47     B9 4 0
120 HD 53339 Y*O 07 04 15.8826541597 -11 24 05.693106995   9.55 9.41 10.56 9.30 B3V 22 0
121 HRW 18 Y*? 07 04 17.6291617392 -11 18 09.132274332   12.51 12.00 11.95   A1IV-V 5 0
122 2MASS J07041913-1117130 * 07 04 19.1307230136 -11 17 13.099341336   12.27 12.13     A0IV-V 7 0
123 [SEI99] 119 * 07 04 22.1080788192 -11 39 06.836823036   10.70 10.56     B5 6 0
124 IC 2177 RNe 07 04 25 -10 27.3           ~ 151 2
125 [SEI99] 120 * 07 04 25.0043494608 -11 29 00.746665440   12.12 11.85 11.91   A8-F0: 4 0
126 HD 53367 Ae* 07 04 25.5189757244 -10 27 15.613478141 6.81 7.40 6.96 7.92   B0IV/Ve 321 0
127 [SEI99] 121 Y*O 07 04 26.4097667808 -11 32 21.220668096   12.51 12.26 11.92 11.95 B8 2 0
128 HD 53396 * 07 04 28.9153691424 -11 48 57.905453988   9.69 9.67     B8/9II 7 0
129 [SEI99] 123 * 07 04 30.9682492368 -11 33 54.264911760   11.93 11.71 11.79   B5-7 2 0
130 [SEI99] 124 ** 07 04 35.308464 -11 44 58.17012   10.599 10.497 10.794   B7 3 0
131 HRW 21 Em* 07 04 35.9003932320 -11 04 48.255933648   15.83 14.58     F0e 8 0
132 HD 53456 ** 07 04 38.30264 -11 31 26.6198 6.41 7.31 7.40     B0IV 53 0
133 HD 53457 * 07 04 38.4737166456 -11 59 07.627584552   9.30 9.31     B9III 9 0
134 [SEI99] 127 * 07 04 44.9244654960 -12 24 34.202329452   11.06 10.67     B6 1 0
135 ALS 17708 * 07 04 45.3 -10 34 12 10.74 10.91 10.77     B8III-IV 5 0
136 2MASS J07044736-1056174 * 07 04 47.3577112776 -10 56 17.553135624   13.89 13.31     A0V: 9 0
137 HRW 25 * 07 04 47.5504342187 -11 06 36.467803906   13.48 13.10     A1IV-V: 4 0
138 EM* LkHA 223 Em* 07 04 48 -11 34.4           ~ 2 0
139 HD 53515 * 07 04 51.4720354200 -11 54 51.819754140   9.19 9.19     B9.5III/IV 4 0
140 [SEI99] 132 * 07 04 53.6549088120 -11 15 19.116710568   11.85 12.32     B6-7 3 0
141 HRW 26 * 07 04 53.9526731568 -10 38 49.418670804   13.04 12.39 12.29   A1IV 4 0
142 [SEI99] 133 * 07 04 59.1445872696 -12 02 30.781807152   11.93 11.55 11.60   F0 1 0
143 [SEI99] 134 * 07 05 00.2479612728 -12 12 42.953021100   11.73 12.13     A5 1 0
144 [SEI99] 137 * 07 05 01.8228777240 -10 22 02.178772608   11.41 11.07     B6-8 3 0
145 [SEI99] 139 * 07 05 04.2523141848 -10 22 31.333345896   12.02 11.86 11.91   B9-A0 1 0
146 HD 53569 * 07 05 07.1599186128 -10 49 59.788510212   10.43 10.29     A2/4V 5 0
147 [SEI99] 141 * 07 05 07.4386549776 -10 51 18.349529400   9.94 9.88     B9 3 0
148 [SEI99] 136 * 07 05 09.9420111024 -12 06 00.165142512   11.57 11.02     F1 2 0
149 [SEI99] 138 * 07 05 11.4826156392 -12 06 01.975866984   12.81 12.56 12.57   A8 1 0
150 HD 53623 * 07 05 16.7478814056 -12 19 34.495070124 7.02 8.88 8.87 8.84   B1II/III 77 1
151 HD 53622 * 07 05 18.5127165192 -11 17 22.177637448   9.27 9.35     B5/7III 11 0
152 [SEI99] 143 * 07 05 19.2006188544 -11 36 48.672904356   10.58 10.54     B6-8 3 0
153 [SEI99] 145 * 07 05 26.5243023384 -11 11 21.745343184   11.61 11.54     B7-8 1 0
154 [SEI99] 146 * 07 05 33.5317494048 -10 18 16.170510240   10.93 10.92     B8-9 2 0
155 [SEI99] 147 * 07 05 34.1588244288 -10 34 53.748428520   11.95 11.91     F0-1 2 0
156 [SEI99] 148 * 07 05 34.4333616214 -11 24 04.445870055   10.97 10.51     A5-8 1 0
157 HD 53691 * 07 05 37.6201303968 -11 09 26.158209516 8.71 9.32 9.38     B3/5III 29 0
158 HD 53723 * 07 05 39.6841944456 -11 34 05.589639408   9.89 9.88     B9.5IV/V 5 0
159 [SEI99] 152 * 07 05 45.1440004104 -10 19 23.468883456   10.79 10.68     A4 2 0
160 [SEI99] 151 * 07 05 45.9478642200 -11 16 05.541395772   11.85 11.60 11.68   A8-F0 2 0
161 V* V569 Mon bC* 07 05 49.6395658880 -10 39 36.289526897 5.55 6.43 6.52 7.55   B1II/III 110 0
162 BD-10 1864 * 07 05 51.4321990560 -10 34 26.929858440   10.18 10.24     B7-8 3 0
163 HD 53776 * 07 05 52.4300959344 -11 05 41.481206520   9.20 9.14     A0V 7 0
164 BD-10 1866 * 07 05 53.8673834880 -10 47 42.876758040   10.40 10.53     B4-6 4 0
165 [SEI99] 155 * 07 05 54.6517709760 -11 20 15.157756788   10.66 10.38     F1-2 3 0
166 [SEI99] 157 * 07 05 59.1668798016 -11 14 26.855704392   11.24 10.82     F1-2 3 0
167 NAME CMa R1 As* 07 08 21.3 -11 04 50           ~ 84 1
168 HD 54662 SB* 07 09 20.2493151288 -10 20 47.635088964 5.35 6.24 6.21 7.23   O6.5Vz(n)+O7.5Vz 340 2
169 NAME III CEP ASSOC As* 23 04.2 +63 24           ~ 322 0

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