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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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Osservazione e dati astrometrici
| Costellazione: | Lira |
| Ascensione retta: | 19h23m46.09s |
| Declinazione: | +39°49'08.6" |
| Magnitudine apparente: | 8.01 |
| Distanza: | 327.869 parsec |
| Moto proprio RA: | 5.3 |
| Moto proprio Dec: | -12.4 |
| B-T magnitude: | 8.109 |
| V-T magnitude: | 8.019 |
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