NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Five years of photometry of Sigma GeminorumThirteen observatories have collaborated in obtaining five years of photoelectric photometry for the bright, K1 III RS CVn binary Sigma Geminorum. Except for one year, the light curve has exhibited two minima which are separated by approximately half a cycle. At the 1977.2 epoch of discovery one minimum was shallower, but as of 1982.2 they have become comparable in depth. During the 1979-80 season, the light curve changed shape rapidly, with the shallower minimum becoming as deep as the other within a period of no more than 80 days. The overall brightness range during the five years in V has been 4.13-4.29 mag, and it is found that the times of both minima can be fit with a photometric period of 19.423 days.
Document ID
19830058525
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Fried, R. E.
(Braeside Observatory Flagstaff, AZ, United States)
Vaucher, C. A.
(Dyer Observatory Nashville, TN, United States)
Hopkins, J. L.
(Hopkins-Phoenix Observatory Phoenix, AZ, United States)
Sabia, J. D.
(Keystone Junior College Observatory Scranton, PA, United States)
Krisciunas, K.
(Krisciunas Observatory San Jose, CA, United States)
Chambliss, C. R.
(Kutztown State College Observatory Kutztown, PA, United States)
Landis, H. J.
(Landis Observatory Locust Grove, GA, United States)
Eaton, J. A.
(Dyer Observatory Nashville, TN, United States)
Hall, D. S.
(Dyer Observatory Nashville, TN, United States)
Henry, G. W.
(Dyer Observatory Nashville, TN, United States)
Date Acquired
August 11, 2013
Publication Date
June 1, 1983
Publication Information
Publication: Astrophysics and Space Science
Volume: 93
Issue: 2, Ju
ISSN: 0004-640X
Subject Category
Astronomy
Accession Number
83A39743
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available