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


Query : 2009A&A...493..175R

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 - 2022
#notes
1 V* EO Cet HS* 01 23 43.2471248112 -05 05 45.831024564   12.21 12.65     sdOV+F4V 62 0
2 PG 1219+534 HS* 12 21 29.0914917288 +53 04 36.796062144   12.41       sdB 81 1
3 BD+25 2534 HS* 12 37 23.5161671712 +25 03 59.867922240 9.117 10.26 10.59 10.642 10.809 sdB1(k) 225 0
4 PG 1325+102 HS* 13 27 48.5600155368 +09 54 51.049107756   13.73 13.98 14.29   sdBO 54 1
5 PG 1605+072 HS* 16 08 03.6872637792 +07 04 28.748468964   12.53 12.83 13.18   sdB0.2VIHe3 125 0
6 PG 1613+426 HS* 16 14 46.9286241816 +42 27 35.946945648   13.99 14.39 14.76   sdOA 22 0
7 PG 1716+426 HS* 17 18 03.8584522800 +42 34 12.562847292   13.69 13.97     sdB2VIIHe3 104 0
8 V* LS Dra HS* 18 24 52.4115107856 +57 47 23.528193612           sdOB 18 0
9 KPD 2109+4401 HS* 21 11 47.6445824136 +44 13 50.620755936 12.14 13.11 13.30 13.64   sdB 64 0
10 Balloon 90100001 HS* 23 15 21.4810390968 +29 05 01.433373360   11.90 12.30     sdB 83 0

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2022.10.06-19:53:53

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