Other
Scientific paper
Nov 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984aj.....89.1716h&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 89, Nov. 1984, p. 1716-1720. Research supported by the Perkin Fund and Research Corp
Other
26
Electrophotometry, H Alpha Line, Stellar Spectrophotometry, Ubv Spectra, Emission Spectra, Light Curve, Stellar Color, Stellar Magnitude
Scientific paper
UBVRI and H-alpha photometry of four Orion population stars has been obtained with the Perkin telescope at Van Vleck Observatory during the interval of October 1983 to March 1984. RY Tau underwent a dramatic increase in brightness during this period, reaching a level (V = 9.43) not seen in more than two decades. At the same time, the equivalent width of its H-alpha emission line (measured photometrically) decreased and, in the longer-wavelength color indices, has begun to show the 'bluer when brighter' syndrome characteristic of other weak emission-line Orion population stars. Spectra taken during the 1983-1984 season, or as soon as possible this season (if the star remains bright), could provide critical information on the nature of the variability mechanism. T Ori and NV Ori also showed substantial variability, and their color and H-alpha characteristics are discussed. HH Aur showed little or no variation during the present observations.
Herbst William
Stine Peter C.
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