2002A&A...386..249D


C.D.S. - SIMBAD4 rel 1.7 - 2021.06.17CEST08:04:35

2002A&A...386..249D - Astronomy and Astrophysics, volume 386, 249-255 (2002/4-4)

HS 0702+6043 - A new large amplitude sdB variable at the cool end of the instability region.

DREIZLER S., SCHUH S.L., DEETJEN J.L., EDELMANN H. and HEBER U.

Abstract (from CDS):

We report on time series photometry of hot sdB stars from the Hamburg Schmidt survey carried out at the Calar Alto 1.23m and 2.2m telescopes. Among 14 spectroscopically selected candidates we detected oscillations in the sdB star HS 0702+6043 with a period of 363s and an amplitude of 29mmag which is among the largest amplitude observed in sdBV stars. A second period of 382s with a significantly smaller amplitude (3.8mmag) might be present. Our NLTE model atmosphere analysis of the time-averaged optical spectra, obtained at the Calar Alto 3.5m telescope, indicates that HS 0702+6043 has Teff=28400K and logg=5.35. This places the star at the cool end of the theoretical sdBV instability strip (EC14026 stars). Among the other thirteen sdB stars we confirmed the variablity of the previously discovered sdBV HS 0815+4243 and identified twelve stars to be stable, for which we give upper limits for light variations.

Abstract Copyright:

Journal keyword(s): stars: subdwarfs - stars: oscillations - stars: individual: HS 0702+6043 - stars: fundamental parameters - stars: horizontal branch

Simbad objects: 17

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Number of rows : 17

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 KUV 02338+3038 HS* 02 36 48.2167602175 +30 50 56.924277871     13.2     sdB 7 0
2 HS 0357+0133 HS* 03 59 52.1880504457 +01 42 08.532721889   15.01 14.94 14.88   sdB 5 0
3 HS 0702+3206 ? 07 05 +32.0           ~ 1 0
4 V* DW Lyn HS* 07 07 09.7959993247 +60 38 50.158351555   14.7   15.34   sdB 48 1
5 HS 0741+3818 HS* 07 45 08.0543076493 +38 11 06.756280641   14.71 14.91 14.91   sdB 11 0
6 V* DV Lyn HS* 08 19 17.7184761515 +42 33 38.727548286   16.1       sdOB 24 0
7 Feige 48 HS* 11 47 14.4977747924 +61 15 31.790488292   13.12 13.28     sdB 112 0
8 GD 351 HS* 15 44 38.1014359737 +62 43 24.623043940   14.62 14.83     sdO7VIIHe1 14 0
9 PG 1649+356 HS* 16 50 54.3819672087 +35 33 42.323626261   15.01 15.49     sdB 17 0
10 HS 1741+2133 HS* 17 43 19.0311359264 +21 32 37.570663621   13.82 13.99 14.21   sdOB 10 0
11 HS 1806+5024 HS* 18 07 38.8712199867 +50 25 12.780044767   16.5   16.8   sdOB 6 0
12 KUV 18312+6432 HS* 18 31 27.1397255826 +64 34 41.731448263   14.97 15.29 15.76   sdB 15 0
13 HS 2100+1710 HS* 21 03 05.4309345056 +17 22 34.434129720   15.24 15.06 15.61   sdOB 7 0
14 HS 2144+2231 * 21 46 +22.7           ~ 2 0
15 HS 2202+2101 * 22 04 +21.3           ~ 2 0
16 V* V391 Peg HS* 22 04 12.1044101613 +26 25 07.820507559   14.41 14.61 15.00   sdB 101 2
17 HS 2242+3206 HS* 22 45 03.5926182270 +32 21 51.172780287     13.85     sdB 8 0

    Equat.    Gal    SGal    Ecl

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2021.06.17-08:04:35

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