V420 Aurigae
Coordinates: 
05h 22m 35.2305s, +37° 40′ 33.629″
05h 22m 35.2305s, +37° 40′ 33.629″| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Auriga |
| Right ascension | 05h 22m 35.23140s[2] |
| Declination | +37° 40′ 33.6386″[2] |
| Apparent magnitude (V) | 7.35 - 7.51[3] |
| Characteristics | |
| Spectral type | B0IVpe[4] |
| U−B color index | −0.88[5] |
| B−V color index | +0.16[5] |
| Variable type | |
| Details | |
| HD 34921 A | |
Rotational velocity (v sin i) | 240±4[10] km/s |
| Database references | |
| SIMBAD | data |
V420 Aurigae is a high-mass
compact companion. Closely orbiting each other every 0.8 days, they are a source of X-ray emission.[6]
These coordinates were identified as an X-ray source using the
Balmer line emission, with these varying on a time scale of less than 300 seconds. This lends support to the presence of a compact companion.[13] The system displays an infrared excess, suggesting it has an orbiting circumstellar envelope of gas and possibly dust.[4] The system appears to be positioned at the center of an irregular, wispy nebula that was detected in the infrared band. One of the two filaments in this nebula appears to be connected with the system.[12]
References
- ^ "/ftp/cats/more/HIP/cdroms/cats". Centre de Données astronomiques de Strasbourg. Strasbourg astronomical Data Center. Retrieved 15 October 2022.
- ^ S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ AAVSO, retrieved 2022-06-12
- ^ Bibcode:1990A&A...231..354P.
- ^ doi:10.1086/111296.
- ^ S2CID 120898311.
- S2CID 119231169.
- S2CID 249461983.
- .
- S2CID 119944672.
- ^ "HD 34921". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-11-10.
- ^ S2CID 119443071, A37.
- Bibcode:1991A&A...249L..19R.
Further reading
- Norci, L.; et al. (December 2006), "Is the X-ray Transient HD 34921 (4U 0515+38) a B[e] Star?", Stars with the B[e] Phenomenon. ASP Conference Series, Vol. 355, Proceedings of the Conference Held 10-16 July, 2005, at the Isle of Vlieland, The Netherlands, vol. 355, San Francisco: Astronomical Society of the Pacific, p. 289, Bibcode:2006ASPC..355..289N.
- Polcaro, V. F.; et al. (2007), St.-Louis, Nicole; Moffat, Anthony F.J. (eds.), "The Very Unusual HMXRB HD 34921", Massive Stars in Interactive Binaries, ASP Conference Series 367, vol. 367, San Francisco: Astronomical Society of the Pacific, p. 471, Bibcode:2007ASPC..367..471P.
- Waagen, Elizabeth O. (October 2016), "Observations of V420 Aur (HD 34921) needed to support spectroscopy", AAVSO Alert Notice 554, vol. 554, p. 1, Bibcode:2016AAN...554....1W.
- Polcaro, V. F.; et al. (2006), Meurs, E. J. A.; Fabbiano, G. (eds.), "The Be/X-ray transient HD34921", Populations of High Energy Sources in Galaxies Proceedings of the 230th Symposium of the International Astronomical Union, Held in Dublin, Ireland 15-19 August 2005, vol. 1, Cambridge: Cambridge University Press, pp. 49–50, .
External links
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