HP Lyr - possibly the hottest RV Tau type object

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dc.creatorGraczyk, Dariusz
dc.creatorMikolajewski, Maciej
dc.creatorLeedjarv, Laurits
dc.creatorFrackowiak, Sylwia M.
dc.creatorOsiwala, Jedrzej P.
dc.creatorPuss, Alar
dc.creatorTomov, Toma
dc.date2002-10-19
dc.date.accessioned2026-07-07T06:30:33Z
dc.date.available2026-07-07T06:30:33Z
dc.descriptionWe report Johnson's UBVRI photometric and optical spectroscopic observations of a long period variable HP Lyr which up to now has been considered an eclipsing binary with a period of 140 days. The spectral type changes continually from A2-3 at maxima to A7-F2 at minima. We propose that the brightness changes are caused by the pulsation of the star with two periods: P1=69.35, and P2=2xP1=138.7 days. These periods decreased by more than 1% between 1960 and 1980. The spectral luminosity class determination gives an A type supergiant Iab. HP Lyr is also the optical counterpart of the infrared source IRAS 19199+3950. Relatively high galactic latitude (b=+11.7 degr) and high radial velocity (-113 km/s) indicate that HP Lyr is an evolved, most likely post-AGB star. All presented features argue that this star is an RV Tau type object.
dc.description13 pages, 10 figures
dc.identifierhttps://arxiv.org/abs/astro-ph/0210448
dc.identifierhttp://arxiv.org/abs/astro-ph/0210448
dc.identifierActa Astron. 52 (2002) 293
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/98370
dc.subjectAstrophysics
dc.titleHP Lyr - possibly the hottest RV Tau type object
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