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BVRI Photometry of nz Gem, HD 73017, HD 77247, RT Vir and 104 Her
We examined single channel differential BVRI photometry of the coolstars NZ Gem, HD 73017, HD 77247, RT Vir and 104 Her obtained by thefirst author with the Four College Automated Photoelectric Telescopewith of order 100 observations taken over two or more years. Four ofthese stars are Small-Amplitude Red Variables (SARVs). The primaryperiod of NZ Gem (M3 II-IIIs) is about 33.70 days. HD 77247, theshortest period barium star with spectral type K0, has a photometricperiod of about 82 days which is close to its binary period of 80.53days. Its check star HD 73017, a non-variable in B, V and R, is variablein I due most likely to a previously unknown cooler companion. RT Vir(M8 III) is found to be a multiperiodic star whose observations areconsistent with the 155 day primary period of Lebzelter & Hinkle(2002). 104 Her (M3 III) is also multiperiodic with a primary period of21.48 days.
| Spectral Classification of Stars in A Supplement to the Bright Star Catalogue
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Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1980A&AS...42..311H&db_key=AST
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Datos observacionales y astrométricos
| Constelación: | Géminis |
| Ascensión Recta: | 07h31m59.25s |
| Declinación: | +12°39'40.7" |
| Magnitud Aparente: | 6.515 |
| Distancia: | 139.665 parsecs |
| Movimiento Propio en Ascensión Recta: | 5 |
| Movimiento Propio en Declinación: | -39.2 |
| B-T magnitude: | 7.79 |
| V-T magnitude: | 6.621 |
Catálogos y designaciones:
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