dc.contributor.author |
Mohin, S |
|
dc.contributor.author |
Raveendran, A. V |
|
dc.date.accessioned |
2008-07-01T05:56:33Z |
|
dc.date.available |
2008-07-01T05:56:33Z |
|
dc.date.issued |
1992-03 |
|
dc.identifier.citation |
A&A, Vol. 256, No. 2, pp. 487 - 494 |
en |
dc.identifier.issn |
0004-6361 |
|
dc.identifier.uri |
http://hdl.handle.net/2248/2563 |
|
dc.description.abstract |
Differential BV photometry of DM UMa obtained on 77 nights during the six observing seasons over the years 1984-90 is presented. The phases of the light minima observed during 1988-90 are found to be nearly the same. The variation in B-V indicates that the star is redder at fainter visual magnitudes. We have analyzed all the B and V light curves of DM UMa available from 1979 onwards by means of a spot model which assumes that large discrete spots are responsible for the observed light variation; the method of least squares was employed to derive the best-fit spot parameters. Observationally, we find that from 1984 onwards the brightness at light curve maximum has increased monotonically whereas the amplitude of light variation has remained within a narrow range without any apparent trend; the modelling indicates a slow migration of the spots towards the equator and a gradual decrease of the spot area during the corresponding period. We derive a mean spot temperature of 3400 +/- 60 K from the data obtained during 10 of the observing seasons. |
en |
dc.format.extent |
1335351 bytes |
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dc.format.mimetype |
application/pdf |
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dc.language.iso |
en |
en |
dc.publisher |
EDP Sciences |
en |
dc.relation.uri |
http://adsabs.harvard.edu/abs/1992A%26A...256..487M |
en |
dc.subject |
Binary stars |
en |
dc.subject |
Stellar spectrophotometry |
en |
dc.subject |
Light curve |
en |
dc.subject |
Stellar color |
en |
dc.subject |
Stellar magnitude |
en |
dc.title |
Photometric study of the RS CVn binary DM Ursa Majoris |
en |
dc.type |
Article |
en |