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| Query : 1994A&A...292..457T |
1994A&A...292..457T - Astronomy and Astrophysics, volume 292, 457-462 (1994/12-2)
Detecting red stellar companions to hot subdwarfs with CCD imaging.
THEJLL P., THEISSEN A. and JIMENEZ R.
Abstract (from CDS):
A search for red stellar companions to hot subdwarfs, using BRI and Z filter CCD imaging, is presented. 5, possibly 6, companions to 20 sdB and sdO stars have been detected-only one of which has been previously reported. For the sdB PG0822+645 the found companion corresponds to a wide binary system, which is also the case for the sdO Mrk509C. These systems should therefore be common proper motion pairs. The details of a search for a previously proposed companion to Feige 34 are given - there is no evidence for a resolvable companion, and the analysis of the photometry of the companion to the sdO Mrk509C is given. Distance and gravity for the sdO are predicted, for various assumptions.
Abstract Copyright: ∼
Journal keyword(s): stars: PG 0822+645, Mrk 509C, subdwarfs, visual binaries
Nomenclature: [TTJ94] Feige 34 A (Nos A-B, G).
CDS comments: T.3: Coordinates of star Mrk 309C are 2000, not 1950.
Simbad objects: 16
| Number of rows : 16 |
| 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 | HS 0016+0044 | HS* | 00 18 43.5160419600 | +01 01 23.632082616 | 14.75 | 14.88 | 15.13 | sdB1.5VIIHe2 | 21 | 0 | ||
| 2 | PG 0042+211 | HS* | 00 45 11.1754413648 | +21 21 07.853809860 | 15.50 | 15.81 | 16.30 | sdOA | 9 | 0 | ||
| 3 | PG 0046+078 | WD* | 00 48 37.8852581712 | +08 02 44.860028568 | 15.59 | 15.590 | DO | 21 | 0 | |||
| 4 | PG 0216+246 | HS* | 02 19 44.5907212800 | +24 47 24.004306896 | 16.20 | 16.36 | 16.43 | sdOD | 12 | 0 | ||
| 5 | PG 0231+051 | WD* | 02 33 41.3574299856 | +05 18 43.649856216 | 14.562 | 15.776 | 16.096 | 16.267 | 16.639 | DAO.6 | 148 | 0 |
| 6 | PG 0310+149 | HS* | 03 13 37.1755354608 | +15 06 21.265349004 | 15.36 | sdO | 21 | 0 | ||||
| 7 | PG 0822+645 | HS* | 08 27 16.5411361608 | +64 22 25.052337588 | 15.02 | 15.44 | 15.84 | sdB | 11 | 0 | ||
| 8 | Feige 34 | HS* | 10 39 36.7358839104 | +43 06 09.212615280 | 9.613 | 10.91 | 11.14 | 11.319 | 11.464 | sdOp | 679 | 0 |
| 9 | 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 |
| 10 | BD-07 3477 | HS* | 12 44 20.2386233232 | -08 40 16.846099536 | 10.46 | 10.594 | 10.895 | sdB2VIIHe3 | 288 | 1 | ||
| 11 | [L92b] Mark A | HS* | 20 43 59.2253596272 | -10 47 41.696051820 | 11.854 | 13.010 | 13.256 | 13.370 | 13.494 | sdO | 70 | 1 |
| 12 | Mrk 509 | Sy1 | 20 44 09.7504483224 | -10 43 24.727155528 | 13.35 | 13.12 | 10.7 | ~ | 1276 | 0 | ||
| 13 | BD+28 4211 | HS* | 21 51 11.0221915656 | +28 51 50.367627468 | 8.922 | 10.25 | 10.58 | 10.656 | 10.831 | sdO2VIIIHe5 | 798 | 0 |
| 14 | PG 2218+020 | HS* | 22 21 24.8247732048 | +02 16 18.431313708 | 13.6 | 13.9 | sdB2.5VIIHe3 | 16 | 0 | |||
| 15 | HS 2253+0900 | HS* | 22 55 50.9727681192 | +09 17 00.118087980 | 14.00 | 13.94 | 14.16 | sdB8IVHe2 | 4 | 0 | ||
| 16 | BPS CS 29521-0051 | HS* | 23 04 23.0143727808 | +07 45 10.477907100 | 14.44 | 14.07 | sdB8IIIHe0 | 9 | 0 |
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