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HD 202577


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Stromgren and H-beta photometry of stars earlier than G0 in 5 areas containing high latitude molecular clouds
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1989A&AS...80..127F&db_key=AST

Four-colour photometry of eclipsing binaries XXVI B. - Light curves of RY AQR
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1987A&AS...68..187H&db_key=AST

Four-colour photometry of eclipsing binaries. XXVI A - RY Aqr: A low-mass semidetached system with intrinsic variability
The first photoelectric analysis is presented of new uvby light curves(Helt, 1986) of the variable star RY Aquarii. RY Aqr is a double-lined,eclipsing binary consisting of a late A/early F main sequence star andan early K subgiant. The analysis is based on an improved determinationof the dimensions from the light curves combined with the spectroscopicresults from Popper. The analysis is complicated by intrinsicvariability, leading to an accuracy in the radii of about 3 percent andin the masses of 4-5 percent. The hotter star has an unusually low mass(1.27 solar masses) and may be slightly metal deficient (Fe/H = -0.4).Its empirical log g value is large (4.33) so that the star lies close tothe ZAMS. The photometrically best fitting solution leads to a volumefor the K subgiant that is a few percent smaller than its availableRoche lobe volume.

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Observation and Astrometry data

Constellation:Aquarius
Right ascension:21h16m58.24s
Declination:-10°08'06.1"
Apparent magnitude:7.02
Distance:218.341 parsecs
Proper motion RA:2.8
Proper motion Dec:-17.6
B-T magnitude:7.116
V-T magnitude:7.028

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 202577
TYCHO-2 2000TYC 5776-1147-1
USNO-A2.0USNO-A2 0750-20727964
HIPHIP 105060
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