TESS photometry of extreme helium stars PV Tel and V821 Cen-Reference-Cited by-同舟云学术

TESS photometry of extreme helium stars PV Tel and V821 Cen

Published:2020-04-29 Issue:1 Volume:495 Page:L135-L138
ISSN:1745-3925
Container-title:Monthly Notices of the Royal Astronomical Society: Letters
language:en
Short-container-title:

Author:

Jeffery C Simon¹^ORCID,Barentsen Geert²,Handler Gerald³

Affiliation:

1. Armagh Observatory and Planetarium, College Hill, Armagh BT61 9DG, UK

2. Bay Area Environmental Research Institute, PO Box 25, Moffett Field, CA 94035, USA

3. Nicolaus Copernicus Astronomical Center, Polish Academy of Sciences, ul. Bartycka 18, PL-00-716 Warsaw, Poland

Abstract

ABSTRACT PV Tel variables are extreme helium (EHe) stars known to be intrinsic light and velocity variable on characteristic time-scales of 0.1–25 d. With two exceptions, they are best described as irregular. Light curves have invariably been obtained from single-site terrestrial observatories. We present Transiting Exoplanet Survey Satellite observations of two bright EHe stars, Popper’s star (V821 Cen) and Thackeray’s star (PV Tel). PV Tel is variable on time-scales previously reported. V821 Cen is proven to be variable for the first time. Neither light curve shows any evidence of underlying regularity. Implications are considered.

Funder

NASA

Polish National Science Centre

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

Link

http://academic.oup.com/mnrasl/advance-article-pdf/doi/10.1093/mnrasl/slaa075/33144659/slaa075.pdf

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