2009A&A...493..175R


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.02CET03:38:15

2009A&A...493..175R - Astronomy and Astrophysics, volume 493, 175-183 (2009/1-1)

Time-series spectroscopy and photometry of the pulsating subdwarf B star PG 1219+534 (KY UMa).

REED M.D., EGGEN J.R., HARMS S.L., TELTING J.H., OSTENSEN R.H., O'TOOLE S.J., TERNDRUP D.M., ZHOU A.-Y., KIENENBERGER R.L. and HEBER U.

Abstract (from CDS):

We present observations and analysis of time-series spectroscopy and photometry of the pulsating subdwarf B star PG 1219+534 (KY UMa). Subdwarf B stars are blue horizontal branch stars that have shed most of their hydrogen envelopes. Pulsating subdwarf B stars allow a probe into this interesting phase of evolution. Low-resolution spectra were obtained at the Nordic Optical Telescope and Kitt Peak National Observatory, and photometric observations were obtained at MDM and Baker observatories in 2006. We extracted radial velocity and equivalent width variations from several Balmer and He I lines in individual spectra. The pulsation frequencies were separated via phase binning to detect line-profile variations in Balmer and helium lines, which were subsequently matched to atmospheric models to infer effective temperature and gravity changes throughout the pulsation cycle. From the photometry we recovered the four previously observed frequencies and detected a new fifth frequency. From the spectra we directly measured radial velocity and equivalent width variations for the four main frequencies and from atmospheric models. We successfully inferred temperature and gravity changes for these four frequencies. We compared amplitude ratios and phase differences of these quantities and searched for outliers that could be identified as high-degree modes. These are the first such measurements for a ``normal'' amplitude pulsating subdwarf B star, indicating that spectroscopic studies can benefit the majority of pulsating subdwarf B stars.

Abstract Copyright:

Journal keyword(s): techniques: radial velocities - stars: subdwarfs - stars: variables: general - techniques: spectroscopic - stars: individual: PG 1219+534

Simbad objects: 10

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Number of rows : 10

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 V* EO Cet HS* 01 23 43.2472884132 -05 05 45.831031643   12.21 12.65     sdOV+F4V 58 0
2 PG 1219+534 HS* 12 21 29.0915970330 +53 04 36.796970097   12.41       sdB 79 1
3 BD+25 2534 HS* 12 37 23.5157891619 +25 03 59.871049394 9.117 10.26 10.59 10.642 10.809 sdB1(k) 214 0
4 PG 1325+102 HS* 13 27 48.5602550889 +09 54 51.048576366   13.73 13.98 14.29   sdBO 54 1
5 PG 1605+072 HS* 16 08 03.6872880396 +07 04 28.747599362   12.53 12.83 13.18   sdB0.2VIHe3 123 0
6 PG 1613+426 HS* 16 14 46.9285124253 +42 27 35.945737136   13.99 14.39 14.76   sdOA 21 0
7 PG 1716+426 HS* 17 18 03.8584285848 +42 34 12.566188858   13.69 13.97     sdB2VIIHe3 99 0
8 V* LS Dra HS* 18 24 52.4120966396 +57 47 23.542106851           sdOB 18 0
9 KPD 2109+4401 HS* 21 11 47.6446188582 +44 13 50.621291301 12.14 13.11 13.30 13.64   sdB 63 0
10 Balloon 90100001 HS* 23 15 21.4810383697 +29 05 01.429272894   11.90 12.30     sdB 79 0

    Equat.    Gal    SGal    Ecl

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2021.03.02-03:38:15

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