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A search for variability in the hot hydrogen-deficient star BD + 10 deg 2179
The discovery of pulsation in the hot, extremely hydrogen-deficient starBD + 13 deg 3224 has prompted a search for this phenomenon in similarstars. In this paper, spectroscopic and photometric observations of BD +10 deg 2179 made during 1979-82 are presented. No significant variationsare found and a previously reported period in the range 0.162-0.164 dayis not seen in any of the data sequences.
| Search for variability in hydrogen-poor stars. I - Preliminary results of photoelectric observations for six stars
The evolutionary status of hydrogen-poor stars is assessed.Photoelectric observations of six objects are reported as a first stepin a long-term project devoted to a search for variability of a largesample of hydrogen-poor stars. The observed stars exhibit phenomena ofmicrovariability with an amplitude of the order of 0.1m or less. Twoextreme helium stars are examined: a period in the range of0.162d-0.164d is found for BD + 10 deg 2179 with P = 0.1079962d for BD +13 deg 3324. It is noted that the mass-losing O subdwarf (sdO) BD = + 37deg 443 exhibits short-term fluctuations with a time-scale of severalminutes and long-term variations on a scale of months.
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Observation and Astrometry data
| Constellation: | Λέων |
| Right ascension: | 10h42m32.39s |
| Declination: | +10°01'31.8" |
| Apparent magnitude: | 9.286 |
| Proper motion RA: | -40.6 |
| Proper motion Dec: | 0.1 |
| B-T magnitude: | 9.835 |
| V-T magnitude: | 9.332 |
Catalogs and designations:
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