Detection of pulsations in three subdwarf B stars

Details Detection of pulsations in three subdwarf B stars Detection of pulsations in three subdwarf B stars

Mar 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...368..175o&link_type=abstract

Astronomy and Astrophysics, v.368, p.175-182 (2001)

Astronomy and Astrophysics

Astrophysics

40

Subdwarfs, Stars: Oscillations, Stars: Individual: Hs 0815+4243 Hs 2149+0847 Hs 2201+2610

Scientific paper

We report the detection of short period oscillations in the sdB stars HS 0815+4243, HS 2149+0847 and HS 2201+2610 from time-series photometry made at the Nordic Optical Telescope (NOT) from a sample of 31 candidates. Hence these three hot subdwarfs are new members of the EC 14026 class of pulsating sdB stars. One short period is detected for HS 0815+4243 (P ~ 126 s; A ~ 7 mma) and two short periods are seen for HS 2149+0847 (P ~ 142, 159 s; A ~ 11, 7 mma), whereas the single oscillation detected for HS 2201+2610 has a considerably longer period (P ~ 350 s; A ~ 11 mma). Our NLTE model atmosphere analysis of the time-averaged optical spectra indicate that HS 0815+4243 has Teff = 33 700 K and log g=5.95, HS 2149+0847 has Teff = 35 600 K and log g = 5.9, and HS 2201+2610 has Teff = 29 300 K and log g= 5.4. This places the former two at the hot end and the latter at the cool end of the theoretical sdBV instability strip. Based on observations obtained at the Nordic Optical Telescope, operated on the island of La Palma jointly by Denmark, Finland, Iceland, Norway, and Sweden, in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisica de Canarias. Based on observations collected at the German-Spanish Astronomical Center, Calar Alto, operated by the Max-Plank-Institute für Astronomie Heidelberg jointly with the Spanish National Commission for Astronomy.

Affiliated with

Also associated with

No associations

Rating

Detection of pulsations in three subdwarf B stars does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Detection of pulsations in three subdwarf B stars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Detection of pulsations in three subdwarf B stars will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1002359