QR Andromedae
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Double star QR Andromedae |
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| AladinLite | |||||
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Observation dates equinox : J2000.0 , epoch : J2000.0 |
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| Constellation | Andromeda | ||||
| Right ascension | 00 h 19 m 49.93 s | ||||
| declination | + 21 ° 56 ′ 52.2 ″ | ||||
| Apparent brightness | 12.7 (11.4 to 13.2) mag | ||||
| Typing | |||||
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rel. Brightness (G-band) |
(12.24 ± 0.01) mag | ||||
| rel. Brightness (J-band) |
(12.43 ± 0.02) mag | ||||
| B − V color index | (−0.37) | ||||
| Spectral class | Ss | ||||
| Variable star type | CBSS + E | ||||
| Astrometry | |||||
| parallax | (0.50 ± 0.05) mas | ||||
| distance | (6,500) ly 2,000 pc |
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| Proper movement | |||||
| Rec. Share: | (18.47 ± 0.07) mas / a | ||||
| Dec. portion: | (−5.53 ± 0.08) mas / a | ||||
| Physical Properties | |||||
| Dimensions | (0.3 to 0.5) / (<1.5) M ☉ | ||||
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Other names and catalog entries |
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QR Andromedae is an eclipsing star in the constellation Andromeda at a distance of approximately 6,500 light years .
The system is also a super-soft X-ray source which was observed with the ROSAT satellite.
In the visual area, the system shows a fluctuation in brightness of around 0.5 magnitudes with a period of almost 16 hours. It's one of the closest and brightest super soft X-ray sources. It probably consists of a relatively low-mass star with 30 to 50% of the solar mass , which loses matter to a compact star , which is presumably a white dwarf . The system is thus interactive and the soft X-ray radiation arises from accretion (astronomy) by the compact star.
Individual evidence
- ↑ a b c d e f g h QR And. In: SIMBAD . Center de Données astronomiques de Strasbourg , accessed on September 30, 2019 .
- ↑ a b c QR And. In: VSX. AAVSO , accessed September 30, 2019 .
- ↑ a b c T. K. McGrath, PC Schmidtke, AP Cowley, AL Ponder, RM Wagner: Simultaneous Photometry and Spectroscopy of the Supersoft X-Ray Source RX J0019.8 + 2156 (QR Andromedae) . In: [The Astronomical Journal] . 122, No. 3, 2001, pp. 1578-1585. bibcode : 2001AJ .... 122.1578M . doi : 10.1086 / 322109 .