NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Four years of photometry of DK Draconis = HR 4665Differential BV photometry of the K0 III + K0 III long-period RS CVn-type binary DK Dra = HR 4665 in 1977, 1978, 1979, and 1980 at eight different observatories is presented. A least squares fit to times of maximum and minimum light yields the ephemeris JD = 2,443,219.5 + 63.75 d E for times of minimum. This photometric period is 1% shorter than the spectroscopically determined orbital period 64.44 d. The light curve was symmetrical and roughly sinusoidal in 1979 and 1980 but was asymmetrical in 1977 and 1978, with a faster rise to maximum. During these four years DK Dra varied between V = 6.07 and 6.35 m.
Document ID
19830034757
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Eaton, J. A.
(Dyer Observatory Nashville, TN, United States)
Vaucher, C. A.
(Dyer Observatory Nashville, TN, United States)
Detterline, P. K.
(Kutztown State College Kutztown, PA, United States)
Landis, H. J.
(Landis Observatory Locust Grove, GA, United States)
Wasatonic, R. P.
(Lehigh Valley Amateur Astronomical Society Allentown, PA, United States)
Louth, H.
(Louth Observatory Sedro Wooley, WA, United States)
Renner, T. R.
(Scuppernong Observatory Dousman, WI, United States)
Hall, D. S.
(Dyer Observatory Nashville, TN, United States)
Henry, G. W.
(Dyer Observatory Nashville, TN, United States)
Chambliss, C. R.
(Dyer Observatory Nashville, TN, United States)
Date Acquired
August 11, 2013
Publication Date
October 1, 1982
Publication Information
Publication: Astrophysics and Space Science
Volume: 87
Issue: 1-2,
Subject Category
Astronomy
Accession Number
83A15975
Funding Number(s)
CONTRACT_GRANT: NSG-7543
Distribution Limits
Public
Copyright
Other

Available Downloads

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