Mahasim
| Doppelstern Mahasim (θ Aurigae) | |||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| AladinLite | |||||||||||||||||||||
| Beobachtungsdaten Äquinoktium: J2000.0, Epoche: J2000.0 | |||||||||||||||||||||
| Sternbild | Fuhrmann | ||||||||||||||||||||
| Rektaszension | 05h 59m 43,270s [1] | ||||||||||||||||||||
| Deklination | +37° 12′ 45,305″ [1] | ||||||||||||||||||||
| Helligkeiten | |||||||||||||||||||||
| Scheinbare Helligkeit | 2.62 bis 2.70 mag | ||||||||||||||||||||
| Spektrum und Indices | |||||||||||||||||||||
| Veränderlicher Sterntyp | ACV[2] | ||||||||||||||||||||
| B−V-Farbindex | (−0.08)[1] | ||||||||||||||||||||
| U−B-Farbindex | (−0.18)[1] | ||||||||||||||||||||
| R−I-Index | (−0.06)[1] | ||||||||||||||||||||
| Spektralklasse | A0pSi / F2-5 V[3] | ||||||||||||||||||||
| Astrometrie | |||||||||||||||||||||
| Radialgeschwindigkeit | (29.3 ± 1.7) km/s[1] | ||||||||||||||||||||
| Parallaxe | (19.70 ± 0.16) mas[1] | ||||||||||||||||||||
| Entfernung | (165 ± 2) Lj (51) pc | ||||||||||||||||||||
| Eigenbewegung[1] | |||||||||||||||||||||
| Rek.-Anteil: | (43.63 ± 0.21) mas/a | ||||||||||||||||||||
| Dekl.-Anteil: | (−73.79 ± 0.08) mas/a | ||||||||||||||||||||
| Physikalische Eigenschaften | |||||||||||||||||||||
| Radius | (5.1 ± 0.4) R☉[4] | ||||||||||||||||||||
| Effektive Temperatur | (10400 ± 300) K[4] | ||||||||||||||||||||
| Rotationsdauer | 3.62 d[5][2] | ||||||||||||||||||||
| Andere Bezeichnungen und Katalogeinträge | |||||||||||||||||||||
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Mahasim[6] ist ein etwa 170 Lichtjahre entfernter Ap-Stern im Sternbild Fuhrmann mit einer scheinbaren Helligkeit von rund 2,7 mag. In einer Entfernung von knapp 4 Bogensekunden liegt ein Begleitstern der Spektralklasse F2-5 V mit einer scheinbaren Helligkeit von 7,2 mag.[3]
Der Stern trägt auch den historischen Eigennamen Bogardus sowie – in der traditionellen chinesischen Astronomie – 五車四.
Literatur
- Adelman, S. J.; Hensberge, H.; van Rensbergen, W.: General study of the apparently average magnetic Ap star theta Aurigae. I. Data and method; in: Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), Vol. 57, S. 121ff. (Juli 1984), bibcode:1984A&AS...57..121A
Weblinks
Einzelnachweise
- ↑ a b c d e f g h tet Aur. In: SIMBAD. Centre de Données astronomiques de Strasbourg, abgerufen am 8. September 2018 (englisch).
- ↑ a b tet Aur. In: VSX. AAVSO, abgerufen am 8. September 2018 (englisch).
- ↑ a b C. Schröder, J. H. M. M. Schmitt: X-ray emission from A-type stars. In: Astronomy and Astrophysics. 475. Jahrgang, Nr. 2, November 2007, S. 677–684, doi:10.1051/0004-6361:20077429, bibcode:2007A&A...475..677S (englisch).
- ↑ a b D. Shulyak, G. Valyavin, O. Kochukhov, B.-C. Lee, G. Galazutdinov, K.-M. Kim, I. Han, T. Burlakova, V. Tsymbal: The Lorentz force in atmospheres of CP stars: θ Aurigae. In: Astronomy & Astrophysics. 464. Jahrgang, Nr. 3, März 2007, S. 1089–1099, doi:10.1051/0004-6361:20064998, arxiv:astro-ph/0612301, bibcode:2007A&A...464.1089S (englisch).
- ↑ J. B. Rice, D. E. Holmgren, D. A. Bohlender: The distribution of oxygen on the surface of the Ap star θ Aur. An abundance Doppler image to compare with ɛ UMa. In: Astronomy and Astrophysics. 424. Jahrgang, September 2004, S. 237–244, doi:10.1051/0004-6361:20035639, bibcode:2004A&A...424..237R (englisch).
- ↑ von der IAU verifizierte Liste mit dem Namen
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