Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979pasp...91..202a&link_type=abstract
Astronomical Society of the Pacific, Publications, vol. 91, Apr.-May 1979, p. 202-204.
Astronomy and Astrophysics
Astronomy
12
Chromosphere, Dwarf Stars, Late Stars, Stellar Atmospheres, Variable Stars, Flare Stars, Light Curve, Stellar Magnitude, Zeeman Effect
Scientific paper
Eight late-type dwarf stars were surveyed with the KPNO no. 4 0.4-m telescope during the period 1978 May 10 to 17 for photometric variability of the BY Draconis type. Five of the stars were not variable at the 0.02-magnitude level. The appearance of variations of a very substantial amplitude in BD + 36 deg 2322 is new. The object has developed at one point in a full range of at least 0.1 mag. The data are inadequate to establish a period, but a simple sine-wave of period 3.2 days seems to phase the limited observations well. This appearance of BY Dra-like variations in a previously thought nonvariable object suggests that most if not all of the dMe stars are subject to the syndrome. The primary purpose of the observations was to establish rotational phases, but this attempt was frustrated by bad weather, although a few records were obtained which yield a negative result.
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