2009A&A...505..239V


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.14CEST18:19:31

2009A&A...505..239V - Astronomy and Astrophysics, volume 505, 239-248 (2009/10-1)

Interpreting the line-profile variations of subdwarf B pulsators: the case of PG 1336-018 (NY Virginis).

VUCKOVIC M., OSTENSEN R.H., AERTS C., TELTING J.H., HEBER U. and OREIRO R.

Abstract (from CDS):

We analyze the high-resolution time-resolved VLT/ uves spectra of PG1336-018, a rapidly pulsating subdwarf B (sdB) primary in a close orbit with an M5 companion, with the aim to detect the pulsational signal of the primary in line-profile variations.After removing the dominant radial-velocity component inherent to the orbital motion and taking only out-of-eclipse data we computed cross-correlation functions (CCFs) for each individual spectrum and assumed these to approximate the average line profile. We computed predictions of line-profile variations for pulsating sdB stars and present their diagnostic value for mode identification. We detect the pulsation mode at 5435µHz in the line-profile variations of the CCFs which allows us to characterize the detected pulsation mode of PG1336-018. We model the pulsational perturbations of synthetic spectra for a star with physical parameters like PG1336-018 and confront them with the observed spectra. We find that low order Balmer lines can be used as diagnostic tool to identify pulsation modes. A detailed line-profile analysis of the perturbed time-series spectra excludes the l=|m|=(3,3), (1,0), (2,1) and (2,0) modes, but does not allow a unique mode identification among the radial or sectoral dipole or quadrupole modes.

Abstract Copyright:

Journal keyword(s): subdwarfs - binaries: eclipsing - stars: variables: general - line: profiles - stars: oscillations - stars: individual: PG1336-018

Simbad objects: 9

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Number of rows : 9

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 * 20 CVn dS* 13 17 32.5409307 +40 34 21.387477   5.010 4.698     A9IImF2 234 0
4 PG 1325+102 HS* 13 27 48.5602550889 +09 54 51.048576366   13.73 13.98 14.29   sdBO 54 1
5 V* NY Vir HS* 13 38 48.1466489725 -02 01 49.209465866   13.43 13.66 13.75   sdB1VIIHe1 198 1
6 V* V361 Hya ** 14 05 33.00 -27 01 34.1   15.45 15.26 15.16   sdB+ 110 0
7 PG 1605+072 HS* 16 08 03.6872880396 +07 04 28.747599362   12.53 12.83 13.18   sdB0.2VIHe3 123 0
8 KPD 2109+4401 HS* 21 11 47.6446188582 +44 13 50.621291301 12.14 13.11 13.30 13.64   sdB 63 0
9 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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2021.05.14-18:19:31

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