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HD 182592


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HP Lyr - Possibly the Hottest RV Tau Type Object
We report Johnson's UBVRI photometric and optical spectroscopicobservations of a long period variable HPLyr which up to now has beenconsidered to be an eclipsing binary with a period of 140 days. Itsspectral type changes continuously from A2-3 at maxima to A7-F2 atminima. We propose that the brightness changes are caused by pulsationof the star with two periods: P_1=69.35 days, and P_2=2 times P_1=138.7days. These periods decreased by more than 1% between 1960 and 1980. Thespectral luminosity class corresponds to an A type supergiant Iab. HPLyr is also the optical counterpart of the infrared source IRAS19199+3950. Relatively high galactic latitude (b=+11.7 arcd) and highradial velocity (-113 km/s) indicate that HP Lyr is an evolved, mostlikely post-AGB star. All these features suggest that this star is an RVTau type object.

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Observation and Astrometry data

Constellation:Lyre
Right ascension:19h23m46.09s
Declination:+39°49'08.6"
Apparent magnitude:8.01
Distance:327.869 parsecs
Proper motion RA:5.3
Proper motion Dec:-12.4
B-T magnitude:8.109
V-T magnitude:8.019

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 182592
TYCHO-2 2000TYC 3138-444-1
USNO-A2.0USNO-A2 1275-11299076
HIPHIP 95339

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