2002ApJ...578..515B

Query : 2002ApJ...578..515B

2002ApJ...578..515B - Astrophys. J., 578, 515-522 (2002/October-2)

A survey for pulsating hot B subdwarfs in the northern hemisphere.

BILLERES M., FONTAINE G., BRASSARD P. and LIEBERT J.

Abstract (from CDS):

We present the final results of a survey to search for pulsating hot B subdwarf (sdB) stars. We picked our candidates on the basis of their values of Teffand logg, as estimated from available quantitative optical spectroscopy. With the help of a three-channel photometer, we gathered ``white-light'' light curves using a uniform sampling time of 10 s for a total of 74 stars. Our survey had a yield of ∼5.4%, leading to the discovery of detectable luminosity variations in four objects: PG 1047+003, KPD 2109+4401, KPD 1930+2752, and PG 0014+067. For the light curves of the other 70 stars, we derive upper limits on the amplitudes of possible periodic signals (in the period window 20-1000 s) that range from ∼0.05% of the mean brightness of the star at an apparent magnitude of y∼12 to ∼0.20% at y∼15. We use our survey results as well as those of others to discuss the location and extent of the empirical instability ``strip'' for pulsating sdB stars in the logg-Teffdiagram. We also address the question of the coexistence of pulsators and nonvariable stars in the same region of that diagram.

Abstract Copyright: ∼

Journal keyword(s): Stars: Interiors - Stars: Oscillations - Stars: Subdwarfs

Simbad objects: 73

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Number of rows : 73
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 PG 2358+107 HS* 00 01 06.7296663432 +11 00 36.323514252   13.51 13.59 13.89   sdB2VIIHe4 22 0
2 PG 2359+197 HS* 00 02 08.4740452488 +19 59 13.142278968   14.40       sdB 18 0
3 PG 0004+133 HS* 00 07 33.7731772800 +13 35 57.590895264   12.63 13.02     sdB2.5VHe7 31 0
4 PG 0005+179 HS* 00 08 17.7769935240 +18 07 58.466942256   14.18 14.43 14.78   sdB 13 0
5 PG 0006+120 HS* 00 08 45.3597030264 +12 17 19.292743860   14.51 14.64 14.89   sdB 13 0
6 PG 0014+068 HS* 00 16 54.2537878176 +07 04 30.043437816   15.3       sdO 73 1
7 PG 0026+047 HS* 00 29 09.0194760816 +04 56 23.443010520   14.79 14.94 15.05   sdB 14 0
8 PG 0039+104 HS* 00 42 13.4700403248 +10 39 10.686736152   15.04 15.16 15.57   sdBO 7 1
9 PG 0048+004 HS* 00 51 07.0239544656 +00 42 32.513344056   15.70 15.81 16.16   sdOB 20 0
10 KPD 0054+5406 HS* 00 57 38.9960112432 +54 22 54.686050860 13.15 14.05 14.12 14.15   sdB 11 0
11 PG 0055+016 HS* 00 58 24.6669707208 +01 54 35.137065384   14.94 15.10 15.44   sdBO 18 0
12 KPD 0106+5227 HS* 01 09 03.2859712080 +52 43 49.334170620 14.87 15.53 15.26 15.98   sdB 11 0
13 PG 0111+177 HS* 01 13 45.5282531904 +17 58 50.106443484   15.85       sdB 13 0
14 PHL 1079 HS* 01 38 26.9920350720 +03 39 39.089787300   12.4 12.6     sdB+G7V 22 0
15 CD-24 731 HS* 01 43 48.5449039272 -24 05 10.223541204   11.6 11.9     sdBHe0 68 0
16 HS 0213+2329 HS* 02 15 55.4988600864 +23 43 14.213474328           sdOB 7 0
17 PG 0221+217 HS* 02 24 01.2682846416 +21 56 50.175231576   15.62       sdB 16 0
18 PG 0242+132 HS* 02 45 38.8794857304 +13 25 55.644358152   11.78       sdB0.5VHe10 26 0
19 PG 0319+055 HS* 03 21 38.6743563096 +05 38 40.152768900   15.02 15.05 15.16   sdB 25 1
20 KPD 0640+1412 HS* 06 43 31.9129093320 +14 09 26.063776332 14.04 15.02 14.82 15.05   sdB 18 0
21 Ton 313 HS* 08 19 35.9291867760 +31 14 16.578141000   15.36 15.61     sdB 12 0
22 PG 0823+466 HS* 08 26 33.2433366888 +46 23 36.724188120   14.30 14.50 14.73   sdB 15 1
23 PG 0839+399 HS* 08 43 12.7070709648 +39 44 49.808413428 12.918 14.045 14.324 14.445 14.587 sdB 38 0
24 PG 0907+123 HS* 09 10 25.4347130256 +12 08 27.078221868   13.76 13.92 14.19   sdB2VIHe2 34 0
25 PG 0909+164 HS* 09 12 07.2920816328 +16 13 20.453857752   13.88 13.851     sdO8VIIHe1 22 0
26 PG 0909+276 HS* 09 12 51.6607835328 +27 20 31.396804260   11.92 12.10 12.62   sdB0.5VIIHe19 42 1
27 PG 0918+029 HS* 09 21 28.2138172968 +02 46 02.254084824 11.975 13.056 13.327 13.456 13.615 sdB1VIIHe6 113 0
28 Ton 13 HS* 09 22 39.8341061496 +27 02 25.424125980   12.27 12.658     sdB 38 0
29 PG 0921+161 HS* 09 24 38.0950248504 +15 53 19.113880668   14.33       sdB0VIIHe9 12 0
30 PG 0934+186 HS* 09 37 16.2701312016 +18 25 11.246800692   12.85 13.13 13.44   sdB 28 0
31 PG 1000+408 HS* 10 03 54.2702671056 +40 34 18.121531548 11.919 12.988 13.318 13.465 13.631 sdO 35 0
32 PG 1032+406 HS* 10 35 16.5804370224 +40 21 14.417268660   11.38 11.81     sdB 43 1
33 V* UY Sex HS* 10 50 02.8265487864 -00 00 36.879009588 12.063 13.184 13.474 13.606 13.769 sdO9VIIHe6 166 0
34 PG 1051+501 HS* 10 54 18.5257850904 +49 49 59.718599976   13.30 13.59 13.70   sdB 27 0
35 Feige 36 HS* 11 04 31.6443383808 +24 39 42.687580896   12.87 12.78     sdB 54 0
36 PG 1104+243 HS* 11 07 26.2324234560 +24 03 11.108174724   11.49 11.39     sdOB+G2V 33 0
37 PG 1206+165 HS* 12 09 16.6878579816 +16 11 55.047670368   13.64 13.714     sdB+G9V 24 0
38 Feige 65 HS* 12 35 51.1437498960 +42 22 39.720230508   11.78 12.046     sdB2 70 1
39 BD+25 2534 HS* 12 37 23.5161671712 +25 03 59.867922240 9.117 10.26 10.59 10.642 10.809 sdB1(k) 246 0
40 PG 1255+547 HS* 12 57 49.3148874288 +54 25 35.388116796   13.24 13.47 13.71   sdB0.5VIIHe11 24 1
41 PG 1303-114 HS* 13 06 23.1180321624 -11 41 33.337382568   13.47 13.65 14.18   sdB0.2VIIHe3 17 0
42 PG 1340+607 HS* 13 41 59.7716449656 +60 29 40.596661032   12.92 12.93 13.39   sdB 14 0
43 PG 1352-023 HS* 13 55 04.6673960784 -02 30 21.803691528   11.82 12.43     sdO8VIIIHe7 21 1
44 Ton 183 HS* 14 05 59.8351289568 +31 24 36.712574280   13.31 13.49 13.81   sdB 24 0
45 PG 1458+423 HS* 15 00 24.5422137744 +42 05 44.823414084   13.67 13.91 14.26   sdB1.5VIIHe0 24 0
46 Ton 788 HS* 15 14 32.4559114224 +24 10 40.705772196   13.03 13.21     sdB 36 0
47 Ton 245 HS* 15 40 23.4584740128 +26 48 29.782769184   13.653 13.859 14.073   sdB 47 0
48 PG 1616+144 HS* 16 18 23.0938386048 +14 16 12.892149840   13.48       sdB 20 0
49 PG 1619+522 HS* 16 20 38.7296260680 +52 06 08.805043260   13.36       sdB0.5VIIHe7 32 0
50 PG 1648+536 HS* 16 49 59.8505534472 +53 31 31.719097380 12.811 13.835 14.050 14.140 14.264 sdB1VIIHe0 30 0
51 PG 1701+359 HS* 17 03 21.4582783560 +35 48 49.223998800   13.41       sdB1VIHe0 33 0
52 PG 1710+490 HS* 17 12 18.7556895624 +48 58 35.782284900   12.56 13.03     sdB1.5VIIHe3 36 0
53 PG 1722+286 HS* 17 24 11.9612830536 +28 35 26.862921924   13.20 13.19 13.92   sdB0VIIpHe10 25 0
54 PG 1725+252 HS* 17 27 57.3822732240 +25 08 35.697468192   11.54 13.01     sdB1.5VIIHe2 28 0
55 PG 1743+477 HS* 17 44 26.3960708352 +47 41 46.918908168   13.68 13.79 13.99   sdB2VIIHe7 33 0
56 [CW83] 1758+36 HS* 18 00 18.8640522672 +36 28 56.335373724 10.04 11.17 11.39 11.38   sdB0 35 1
57 KPD 1930+2752 HS* 19 32 14.8088063952 +27 58 35.445679608 12.80 13.75 13.82     sdB 159 0
58 KPD 2007+4527 HS* 20 08 57.7110204864 +45 36 05.499046656 14.33 15.35 15.17 15.10   sdB 8 0
59 KPD 2109+4401 HS* 21 11 47.6445824136 +44 13 50.620755936 12.14 13.11 13.30 13.64   sdB 67 0
60 PG 2110+127 HS* 21 13 21.0605578368 +12 57 09.221687280   13.12 12.96 12.98   sdB 22 0
61 PG 2128+096 HS* 21 30 42.5059614912 +09 50 20.786591544   14.47 14.76 15.07   sdB 14 0
62 PG 2128+113 HS* 21 31 12.2367095976 +11 29 36.233995632   15.81 16.06 15.59   sdO 17 1
63 PG 2132+095 HS* 21 34 34.4262179400 +09 40 48.353633832   15.28 15.45 16.11   sdB 11 0
64 PG 2204+035 HS* 22 07 16.4981097216 +03 42 19.847765304   14.10 14.31 14.51   sdB1VIIHe10 24 1
65 KPD 2215+5037 HS* 22 17 20.7353553744 +50 52 58.930200480 12.66 13.59 13.64 14.00   sdB 20 0
66 KPD 2254+5444 HS* 22 57 02.6544437712 +55 00 13.433683104 13.49 14.46 14.37 14.54   sdB 12 0
67 PG 2303+115 HS* 23 05 39.0006368976 +11 45 36.655445880   14.38 14.47 14.79   sdB 10 0
68 Feige 108 HS* 23 16 12.4074790200 -01 50 35.103759540 11.671 12.736 12.973 13.079 13.218 sdB 65 0
69 Feige 109 HS* 23 17 26.8819938360 +07 52 04.910534364   13.87 13.92     sdB1.5VIIIpHe0 37 0
70 PG 2317+046 HS* 23 19 55.3509680256 +04 52 34.659100740 11.493 12.630 12.876 12.950 12.994 sdO8VIIHe1 37 0
71 PG 2323+121 HS* 23 25 59.0237944776 +12 21 23.971804776   14.96 15.07     sdB 12 0
72 HS 2333+3927 HS* 23 35 42.5025647712 +39 44 27.064626936     14.53     sdOB 45 0
73 PG 2335+107 HS* 23 37 43.7887549776 +10 56 26.961827208   15.55       sdB 9 0

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