2003AJ....125..293C


Query : 2003AJ....125..293C

2003AJ....125..293C - Astron. J., 125, 293-321 (2003/January-0)

Spectroscopic binaries, jitter, and rotation in field metal-poor red giant and red horizontal-branch stars.

CARNEY B.W., LATHAM D.W., STEFANIK R.P., LAIRD J.B. and MORSE J.A.

Abstract (from CDS):

We summarize 2007 radial velocity measurements of 91 metal-poor field red giants. Excluding binary systems with orbital solutions, our coverage averages 13.7 yr per star, with a maximum of 18.0 yr. We report four significant findings. (1) Sixteen stars are found to be spectroscopic binaries, and we present orbital solutions for 14 of them. The spectroscopic binary frequency of the metal-poor red giants, with [Fe/H]≤-1.4, for periods less than 6000 days, is 16%±4%, which is not significantly different from that of comparable-metallicity field dwarfs, 17%±2%. The two CH stars in our program, BD -1°2582 and HD 135148, are both spectroscopic binaries. (2) Velocity jitter is present among about 40% of the giants with MV≤-1.4. The two best-observed cases, HD 3008 and BD +22°2411, show pseudoperiodicities of 172 and 186 days, longer than any known long-period variable in metal-poor globular clusters. Photometric variability seen in HD 3008 and three other stars showing velocity jitter hints that starspots are the cause. However, the phasing of the velocity data with the photometry data from Hipparcos is not consistent with a simple starspot model for HD 3008. We argue against orbital motion effects and radial pulsation, so rotational modulation remains the best explanation. The implied rotational velocities for HD 3008 and BD +22°2411, both with MV≤-1.4 and R~50 R, exceed 12 km.s–1. (3) Including HD 3008 and BD +22°2411, we have found signs of significant excess line broadening in eight of the 17 red giants with MV≤-1.4, which we interpret as rotation. In three cases, BD +30°2034, CD -37°14010, and HD 218732, the rotation is probably induced by tidal locking between axial rotation and the observed orbital motion with a stellar companion. But this cannot explain the other five stars in our sample that display signs of significant rotation. This high frequency of elevated rotational velocities does not appear to be caused by stellar mass transfer or mergers: there are too few main-sequence binaries with short enough periods. We also note that the lack of any noticeable increase in mean rotation at the magnitude level of the red giant branch luminosity function ``bump'' argues against the rapid rotation's being caused by the transport of internal angular momentum to the surface. Capture of a planetary-mass companion as a red giant expands in radius could explain the high rotational velocities. (4) We also find significant rotation in at least six of the roughly 15 (40%) red horizontal-branch stars in our survey. It is likely that the enhanced rotation seen among a significant fraction of both blue and red horizontal-branch stars arose when these stars were luminous red giants. Rapid rotation alone therefore appears insufficient cause to populate the blue side of the horizontal branch. While the largest projected rotational velocities seen among field blue and red horizontal-branch stars are consistent with their different sizes, neither are consistent with the large values we find for the largest red giants. This suggests that some form of angular momentum loss (and possibly mass loss) has been at work. Also puzzling is the apparent absence of rotation seen in field RR Lyrae variables. Angular momentum transfer and conservation in evolved metal-poor field stars thus pose many interesting questions for the evolution of low-mass stars.

Abstract Copyright:

Journal keyword(s): Stars: Binaries: Spectroscopic - Galaxy: Halo - Stars: Planetary Systems: Formation - Stars: Population II - Stars: Rotation

CDS comments: Par. 9.3.2, star IV-101 in M 3 = Cl* NGC 5272 S I- IV-101

Simbad objects: 101

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Number of rows : 101
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 HD 20 Pe* 00 05 15.3242691048 -27 16 18.140091852   9.65 9.40 8.865 8.377 F2V 65 0
2 HD 97 RG* 00 05 45.9906866184 -19 40 12.886721868   10.402 9.775 9.41   G5V 69 0
3 CD-23 72 * 00 16 16.5547797408 -22 34 40.787827716   10.19 9.57 9.350 8.74 G0 50 0
4 NGC 104 GlC 00 24 05.359 -72 04 53.20   5.78 4.09     ~ 3766 0
5 V* CM Cet LP? 00 33 14.3108581872 -10 43 42.728423844   10.66 9.48 8.84 9.06 G3/5V 94 0
6 HD 3179 PM* 00 34 50.5935786096 -21 52 55.806000384   10.43 9.75 9.37 9.065 F8V 44 0
7 CD-38 245 Pe* 00 46 36.1954514592 -37 39 33.555030480   12.733 11.929 13.39 10.996 KIIvw 215 0
8 BD-11 145 Pe* 00 48 24.3140894760 -10 41 30.892554816   11.54 10.72     KIIvw 49 0
9 HD 5426 PM* 00 55 41.0497469496 -33 45 11.452751640   10.32 9.65 9.43 8.76 G(wp) 57 0
10 BD-20 170 * 00 57 10.2304132224 -19 49 58.260116496   10.88 10.24     ~ 37 0
11 CD-30 298 Pe* 00 58 43.8709169280 -30 05 57.717373920   11.43 10.83     F6Vwl 54 1
12 NGC 362 GlC 01 03 14.26 -70 50 55.6     6.58     ~ 1023 0
13 HD 6755 SB* 01 09 43.0577179701 +61 32 50.264076956 8.48 8.40   7.3   G5 233 0
14 HD 9051 PM* 01 28 46.5026384544 -24 20 25.442103012   9.73 8.92     G6/8IIIwF5 58 0
15 BD-18 271 Pe* 01 37 18.8808986376 -17 29 03.907703472   10.93 9.77     KIIvw 61 0
16 HD 13359 Pe* 02 10 07.0245081144 -20 45 51.651745596   10.36 9.67     G1/2V 38 0
17 BD-22 395 Pe* 02 21 57.9369379920 -21 30 42.994815336   11.313 10.501     ~ 36 0
18 BD+44 493 Pe* 02 26 49.7390353632 +44 57 46.523771136   9.63 9.11     CEMP-no 95 0
19 BD-10 548 PM* 02 46 55.7673781248 -10 07 35.112780804   11.162 10.411     Gwl: 50 0
20 CD-30 1121 Pe* 02 57 00.2888605704 -30 24 37.382171544   11.038 10.312     G0 45 0
21 HD 21581 Pe* 03 28 54.4844652624 -00 25 03.107565696 9.75 9.54 8.71     G8w 122 0
22 HD 23798 Pe* 03 46 45.7220393712 -30 51 13.333194972   9.35 8.32     G8/K1(III)wF0/3 68 0
23 HD 27928 SB* 04 22 55.1398810056 -37 15 49.243422348   10.22 9.53     Gw 49 0
24 HD 36702 Pe* 05 31 52.2291576648 -38 33 24.045172128   9.53 8.38     F0wG/K 71 0
25 BD-19 1422 Pe* 06 21 10.6253279352 -19 15 09.156225708   10.50 9.77     ~ 17 0
26 HD 45282 Pe* 06 26 40.7720940072 +03 25 29.792391024 8.71 8.69 8.03     Gwl 147 0
27 HD 63791 PM* 07 54 28.7247271128 +62 08 10.773103272   8.81 7.90     G0 108 0
28 HD 82590 PM* 09 32 30.2935575936 -17 26 08.699584164   9.81 9.42     F_wl 72 0
29 HD 83212 Pe* 09 36 19.9521173088 -20 53 14.747509716   9.582 9.177 7.83   G6/K0IIIwF7 125 0
30 BD+30 2034 SB* 10 33 14.9262526248 +29 36 54.999596304 12.42 11.62 10.34     K3III 43 0
31 CD-30 8626 Pe* 10 41 09.1899212256 -30 47 04.698723048   10.43 9.70     ~ 37 0
32 HD 93529 Pe* 10 47 29.0132337552 -25 26 14.585676108   10.08 9.31 8.92   G6/8w 59 0
33 BD+22 2411 ** 11 51 33.5335348224 +22 06 52.182486288   11.09 10.04     G0 30 0
34 V* TY Vir Pe* 11 51 50.1113014296 -05 45 44.183830536   9.668 7.97 7.57   G3Ibp 118 0
35 BD-01 2582 Pe* 11 53 37.3231720128 -02 00 36.728298108   10.29 9.60     CEMP-s 104 0
36 HD 103545 Pe* 11 55 27.1610999880 +09 07 45.019860708   9.91 9.20 9.17   KIIvw 68 0
37 BD+09 2574 * 12 02 03.9251150160 +09 00 41.641096860   11.27 10.45     G5 28 0
38 HD 107752 PM* 12 22 52.7183284776 +11 36 25.486007148   10.79 10.07     KIIvw 67 0
39 HD 108317 Pe* 12 26 36.8319587208 +05 18 09.023783400       7.7   G2IVm-5 160 0
40 HD 108577 PM* 12 28 16.8614710944 +12 20 41.089853184   10.18 9.55 9.8   KIIvw 71 0
41 V* KR Vir LP* 12 41 03.6204364704 -00 37 13.819995732 12.628 10.962 9.370 8.538 7.779 KIIvw 63 0
42 HD 110885 * 12 45 19.2564778992 +01 03 21.095763876   9.76 9.12     F3V 52 0
43 HD 111721 RG* 12 51 25.1948519215 -13 29 28.166947989   8.78 7.97     G6V 153 0
44 BD+10 2495 Pe* 12 59 19.9306410576 +09 14 35.634594444   10.44 9.73     G0 72 0
45 BD+12 2547 PM* 13 04 06.5913367608 +11 26 15.827987724   10.88 9.88     ~ 37 0
46 BD+03 2782 * 13 29 55.9119182184 +02 45 26.785202868   10.66 9.73     KIIvw 42 0
47 HD 118055 Pe* 13 34 39.9107087448 -16 19 22.711497564   10.10 8.89 8.45   K0wF8 78 0
48 BD+18 2757 SB* 13 36 31.9718170008 +18 09 02.146161564   10.60 9.83     KIIvw 53 0
49 2MASS J13415502+2819149 RG* 13 41 55.0321396248 +28 19 14.930940144   14.53 13.18     ~ 53 0
50 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2394 0
51 HD 119516 HB* 13 43 26.7251638944 +15 34 31.069770096   9.59 9.12     G5 73 0
52 CD-33 9314 PM* 13 46 03.4846387056 -33 56 27.291456672 10.96 10.742 9.994 9.53   G8:wl 42 0
53 HD 121135 * 13 53 33.5447403552 +02 41 41.185079880   10.14 9.37     KIIvw 62 0
54 HD 121261 Pe* 13 55 05.0203625808 -36 08 18.725498088   10.50 9.21     G2/3II 35 0
55 HD 122956 PM* 14 05 13.0244442888 -14 51 25.455804480   8.18 7.25 6.88   G6IV/VwF6 148 0
56 BD+09 2860 * 14 13 19.7440024872 +08 36 40.040730972   11.39 10.77     ~ 45 0
57 HD 124358 PM* 14 13 21.3207976896 -12 09 24.186647772   10.38 9.54     Gwl 46 0
58 BD+09 2870 PM* 14 16 29.9462349936 +08 27 52.952766408   10.58 9.70     KIIvw 66 0
59 BD+08 2856 * 14 23 58.1664038424 +08 01 33.333124908   10.90 10.08     KIIvw 61 0
60 HD 126587 Pe* 14 27 00.3636631296 -22 14 38.992940592   9.88 9.60 8.75   CEMP-no 129 0
61 BD+18 2890 HB* 14 32 13.4860470912 +17 25 24.289741704   10.49 9.73     ~ 61 0
62 BD-08 3901 Pe* 15 04 51.2326830984 -08 48 56.501484732   10.34 9.44     G0 31 0
63 BD+18 2976 SB* 15 07 24.2861182752 +17 26 58.222699044   10.69 9.88     G0 35 0
64 HD 135148 SB* 15 13 17.4566472168 +12 27 25.533915552   10.87 9.39 8.97   CEMP-s 90 0
65 Cl* NGC 5904 SAW V42 RV* 15 18 24.7809796920 +02 02 53.243386584   12.8100 10.9300     F4 45 1
66 M 5 GlC 15 18 33.22 +02 04 51.7     5.95     ~ 1895 0
67 BD+01 3070 SB* 15 22 40.0572099288 +01 15 53.477547804   10.59 9.98     G0 37 0
68 HD 141531 PM* 15 49 16.4993243976 +09 36 42.408069804   10.31 9.08 8.720   M1V 65 0
69 BD+05 3098 PM* 15 52 17.2564983936 +05 17 44.338170732   11.26 10.56     ~ 43 0
70 V* SX Her RV* 16 07 27.2518832352 +24 54 29.935580580   9.95 8.60     KIIvw 78 0
71 BD+11 2998 HB* 16 30 16.7822155632 +10 59 51.752312592   9.73 9.10     F8 76 0
72 BD+09 3223 HB* 16 33 35.5815849384 +09 06 16.307942544   9.85 9.27     ~ 70 0
73 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2123 0
74 BD+13 3683 SB* 18 33 16.8450962112 +13 09 25.493753160   11.19   10.0   F5 97 0
75 HD 171496 * 18 36 07.4934525456 -24 26 11.309788572   9.59 8.52     G8IV 70 1
76 M 22 GlC 18 36 23.94 -23 54 17.1           ~ 1313 0
77 HD 175305 RG* 18 47 06.4416868934 +74 43 31.451436187 8.07 7.93 7.18 6.52 6.03 G5III 208 0
78 HD 176203 Pe* 19 00 04.1827925376 -23 03 47.886491448   9.48 8.79     F5V 31 0
79 HD 181007 Pe* 19 19 28.4850656256 -20 25 39.631859004   10.41 10.10     G0/3(w) 42 0
80 HD 184266 HB* 19 34 15.3865887336 -16 19 00.228534420 8.27 8.12 7.57     F2V 114 0
81 HD 186478 Pe* 19 45 14.1409752672 -17 29 27.071239056   10.116 9.302 8.527 7.961 K2III 144 0
82 BD-18 5550 Pe* 19 58 49.7371417608 -18 12 11.140126164 10.18 10.03 9.35 9.04 8.74 CEMP-no 169 0
83 HD 193242 Pe* 20 19 54.2939128464 -19 54 46.586662308   9.90 9.19     G6wF2/3 32 0
84 HD 195636 PM* 20 32 48.9463898400 -09 21 51.724664928   10.13 9.57     A9(V)(w) 89 0
85 BD-17 6036 PM* 20 37 15.9313308384 -16 33 58.063824468   11.27 10.56     ~ 43 0
86 BD-20 6008 Pe* 20 42 48.7696080840 -20 00 39.383893620   10.60 9.89     G0 27 0
87 BD-15 5781 Pe* 20 45 34.5446785080 -14 31 15.154963788   11.57 10.83     KIIvw 47 0
88 HD 358059 Pe* 20 56 09.1348060632 -13 31 17.690158776   11.016 10.192     G0 57 0
89 CD-37 14010 SB* 20 57 27.3814587120 -36 32 53.085957612   10.75 9.74     ~ 22 0
90 BD-03 5215 * 21 28 01.3177666440 -03 07 40.921570416   10.79 10.08     Gwl: 51 0
91 HD 206739 PM* 21 44 23.9461069656 -11 46 22.843385220   9.45 8.60 8.14   G5V 77 0
92 BD-09 5831 * 21 45 30.5221325592 -08 24 35.246336040   10.33 9.50 10.08   KIIvw 53 0
93 HD 208069 PM* 21 54 26.0066953368 -30 15 25.248217968   9.93 9.25     G(5/8)wF0 37 0
94 HD 213467 PM* 22 32 07.8972271497 -31 10 24.951994897   9.26 8.58     G5VwF3 58 0
95 HD 214362 HB* 22 37 58.6722777408 -22 38 40.152266772   9.56 8.80     Gwl 57 0
96 HD 214925 Pe* 22 41 59.4323837856 -20 47 03.709481964   10.77 9.30     (F) 33 0
97 V* LS Aqr LP* 23 10 25.3933914936 -13 18 35.342375436   9.92 8.42     G6/8Ib 37 0
98 HD 220662 Pe* 23 25 41.6302515288 -23 56 20.690248524   11.112 10.081     F8/G3 47 0
99 HD 220838 * 23 27 16.4821789104 -26 58 58.175202936   10.50 9.39     G6/8(III)w 53 0
100 HD 221170 Pe* 23 29 28.8087143040 +30 25 57.849303180 9.43 8.74 7.66     G2IV 276 0
101 HD 222434 SB* 23 40 41.5098598776 -34 41 46.553906400   9.85 8.81     G2/3V 49 0

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2022.11.30-18:13:42

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