DY Persei
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Star DY Persei |
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| AladinLite | |||||||
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Observation dates equinox : J2000.0 , epoch : J2000.0 |
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| Constellation | Perseus | ||||||
| Right ascension | 02 h 35 m 17.13 s | ||||||
| declination | + 56 ° 08 ′ 44.7 ″ | ||||||
| Apparent brightness | 11.09 mag 10.5 to 16.0 mag |
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| Typing | |||||||
| B − V color index | +1.79 | ||||||
| R − I index | +1.29 | ||||||
| Spectral class | C4.5 (R8) | ||||||
| Variable star type | DYPer | ||||||
| Astrometry | |||||||
| Radial velocity | −38 km / s | ||||||
| parallax | (0.83 ± 0.05) mas | ||||||
| distance | (3950 ± 250) ly 1,200 pc |
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| Visual absolute brightness M vis | Max. −2.5 mag | ||||||
| Proper movement | |||||||
| Rec. Share: | (+2.34 ± 0.09) mas / a | ||||||
| Dec. portion: | (−0.83 ± 0.09) mas / a | ||||||
| Physical Properties | |||||||
| Effective temperature | 3000 K | ||||||
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Other names and catalog entries |
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DY Persei is a star in the range of about 4000 light years . It is the prototype of the DY Persei stars , which belong to the eruptive variable stars .
Furthermore, this star is a carbon star that is relatively cool. The metallicity is controversial, but could also be very deep.
See also
Individual evidence
- ↑ a b c d e DY Per. In: SIMBAD . Center de Données astronomiques de Strasbourg , accessed September 16, 2018 .
- ^ Watson: The International Variable Star Index (VSX) . In: The Society for Astronomical Sciences 25th Annual Symposium on Telescope Science. Held May 23-25 . 25, 2006, p. 47. bibcode : 2006SASS ... 25 ... 47W .
- ↑ a b c DY Per. In: VSX. AAVSO, accessed September 16, 2018 .
- ↑ L. Začs, S. Mondal, WP Chen, AF Pugach, FA Musaev, O. Alksnis: A comprehensive analysis of the cool RCB star DY Persei . In: Astronomy and Astrophysics . 472, 2007, p. 247. bibcode : 2007A & A ... 472..247Z . doi : 10.1051 / 0004-6361: 20066923 .
- ↑ a b c A. Alksnis, VM Larionov, O. Smirnova, AA Arkharov, TS Konstantinova, LV Larionova, VI Shenavrin: On the Latest Deep Light Decline Event of DY Persei . In: Baltic Astronomy . 18, 2009, p. 53. bibcode : 2009BaltA..18 ... 53A .
- ↑ a b c L. A. Yakovina, AF Pugach, Ya. V. Pavlenko: DY Persei, the coolest metal-poor R CrB carbon star . In: Astronomy Reports . 53, No. 3, 2009, p. 187. bibcode : 2009ARep ... 53..187Y . doi : 10.1134 / S1063772909030019 .