U Aquarii: Difference between revisions
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'''U Aquarii''' ('''U Aqr''') is a [[star]] in the [[constellation]] of [[Aquarius (constellation)|Aquarius]].<ref name=sb0 /> It has an [[apparent visual magnitude]] which varies between 10.6 and 15.9.<ref name=gcvs1 /> |
'''U Aquarii''' ('''U Aqr''') is a [[star]] in the [[constellation]] of [[Aquarius (constellation)|Aquarius]].<ref name=sb0 /> It has an [[apparent visual magnitude]] which varies between 10.6 and 15.9.<ref name=gcvs1 /> |
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In 1999, U Aqr was proposed to be a [[Thorne-Zytkow object]], instead of being a simple [[R Coronae Borealis variable]].<ref>{{cite journal |title= Is U Aquarii a Thorne-Żytkow Object? |author= Andrew D. Vanture |
In 1999, U Aqr was proposed to be a [[Thorne-Zytkow object]], instead of being a simple [[R Coronae Borealis variable]].<ref>{{cite journal |title= Is U Aquarii a Thorne-Żytkow Object? |author= Andrew D. Vanture |author2= Daniel Zucker |author3= George Wallerstein |doi= 10.1086/306956 |publicationdate= April 1, 1999 |volume= 514 |number= 2 |journal= The Astrophysical Journal |bibcode= 1999ApJ...514..932V }}</ref> |
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== Notes == |
== Notes == |
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Revision as of 15:47, 4 May 2015
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Aquarius |
| Right ascension | 22h 03m 19.6992s[1] |
| Declination | −16° 37′ 35.288″[1] |
| Apparent magnitude (V) | 10.6 to 15.9[2] |
| Characteristics | |
| B−V color index | 1.0[1] |
| V−R color index | 0.4[1] |
| Variable type | RCB[2] |
| Astrometry | |
| Proper motion (μ) | RA: 3.03[1] mas/yr Dec.: −2.53[1] mas/yr |
| Parallax (π) | 3.58 ± 2.55 mas[1] |
| Distance | approx. 900 ly (approx. 300 pc) |
| Absolute magnitude (MV) | 6[NB 1] |
| Other designations | |
| Database references | |
| SIMBAD | data |
U Aquarii (U Aqr) is a star in the constellation of Aquarius.[1] It has an apparent visual magnitude which varies between 10.6 and 15.9.[2]
In 1999, U Aqr was proposed to be a Thorne-Zytkow object, instead of being a simple R Coronae Borealis variable.[3]
Notes
- ^ From apparent magnitude and parallax.
References
- ^ a b c d e f g h i V* U Aqr -- Variable Star of R CrB type, database entry, SIMBAD. Accessed on line November 10, 2009.
- ^ a b c U Aqr, database entry, The combined table of GCVS Vols I-III and NL 67-78 with improved coordinates, General Catalogue of Variable Stars, Sternberg Astronomical Institute, Moscow, Russia. Accessed on line November 10, 2009.
- ^ Andrew D. Vanture; Daniel Zucker; George Wallerstein (April 1, 1999). "Is U Aquarii a Thorne-Żytkow Object?". The Astrophysical Journal. 514 (2). Bibcode:1999ApJ...514..932V. doi:10.1086/306956.
{{cite journal}}: Unknown parameter|publicationdate=ignored (|publication-date=suggested) (help)
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