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

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

Oct 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009a%26a...505..239v&link_type=abstract

Astronomy and Astrophysics, Volume 505, Issue 1, 2009, pp.239-248

Astronomy and Astrophysics

Astrophysics

5

Subdwarfs, Binaries: Eclipsing, Stars: Variables: General, Line: Profiles, Stars: Oscillations, Stars: Individual: Pg 1336-018

Scientific paper

Aims: We analyze the high-resolution time-resolved VLT/uves spectra of PG 1336-018, 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. Methods: 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. Results: We detect the pulsation mode at 5435 μHz in the line-profile variations of the CCFs which allows us to characterize the detected pulsation mode of PG 1336-018. Conclusions: We model the pulsational perturbations of synthetic spectra for a star with physical parameters like PG 1336-018 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.
Based on observations from the European Southern Observatory, Chile. Program ID: 075.D-0174.

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