[vsnet-ecl 704] Is HP Lyr an RV Tau star?

[Taichi Kato <tkato@kusastro.kyoto-u.ac.jp>]

Is HP Lyr an RV Tau star?

   Have a look.  HP Lyr was previously recognized as an eclipsing binary
(EB/GS).

Paper: astro-ph/0210448
From: Toma Tomov <toma.tomov@astri.uni.torun.pl>
Date: Sat, 19 Oct 2002 13:47:29 GMT   (42kb)

Title: HP Lyr - possibly the hottest RV Tau type object
Authors: Dariusz Graczyk (1,4), Maciej Mikolajewski (1), Laurits Leedjarv (2),
  Sylwia M. Frackowiak (1), Jedrzej P. Osiwala (1), Alar Puss (2,3), Toma Tomov
  (1)((1)Centre for Astronomy, Nicolaus Copernicus University, Torun, Poland,
  (2)Tartu Observatory, Toravere, Estonia, (3)Department of Physics, Tartu
  University, Tartu, Estonia, (4)Institute of Astronomy, Zielona Gora, Poland)
Comments: 13 pages, 10 figures
Journal-ref: Acta Astronomica (2002) 52, 293
\\
  We 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.
\\ ( http://arXiv.org/abs/astro-ph/0210448 ,  42kb)

VSNET Home Page

Return to Daisaku Nogami

---

vsnet-adm@kusastro.kyoto-u.ac.jp