AH Scorpio , ( AH Sco ) is a red supergiant , a variable star in the constellation Scorpio . With a radius of about 1411 , is one of the largest famous stars .
| AH Scorpio | |||
|---|---|---|---|
| Star | |||
| Observational data ( Age J2000 ) | |||
| Right ascension | 17 h 11 m 17.02114 s [1] | ||
| Declination | -32 ° 19 ′ 30.7132 ″ [1] | ||
| Distance | 7400 St. years (2260 pc ) [2] | ||
| Visible magnitude ( V ) | 6.5 - 9.6 [3] | ||
| Constellation | Scorpio | ||
| Astrometry | |||
| Radial velocity ( R v ) | −13.40 ± 2.4 [4] km / s | ||
| Own movement (μ) | RA: −1.37 [1] Dec: −2.37 [1] | ||
| Parallax (π) | −0.09 ± 0.57 [1] mas | ||
| Absolute magnitude (V) | −5.8 [6] | ||
| Characteristics | |||
| Spectral class | M4-5 Ia-Iab [7] | ||
| Variability | SRc [7] | ||
| physical characteristics | |||
| Radius | 1287 - 1535 [8] R ☉ | ||
| Temperature | 3,682 ± 190 [8] K | ||
| Luminosity | 330,000 [8] L ☉ | ||
| |||
| Database Information | |||
| SIMBAD | data | ||
It is a semi-correct variable with a main period of 714 days. The apparent magnitude varies in the range from 6.5 to 9.6 m [3] No long secondary periods were found [9] .
When modeling AH Sco near the maximum luminosity, a temperature of 3682 K and a luminosity of 330,000 were determined resulting in an estimate of radius 1411 .
AH Sco is surrounded by a dust shell [10] , and SiO, H 2 O, and OH masers are found in the oxygen-rich surrounding substance. Measurements of the position of the masers using VLBI observations made it possible to estimate with high accuracy the distance to the star, equal to 2260 pc . At the time of observation, masers approached the star at a speed of 13 km / s, which indicated a compression process with a phase of 0.55 relative to luminosity variations [2] .
Notes
- ↑ 1 2 3 4 5 F .; Van Leeuwen. Validation of the new Hipparcos reduction // Astronomy and Astrophysics . - EDP Sciences 2007. - Vol. 474 , no. 2 . - P. 653 . - DOI : 10.1051 / 0004-6361: 20078357 . - .
- ↑ 1 2 Xi; Chen; Shen, Zhi-Qiang. VLBI Observations of SiO Masers around AH Scorpii // The Astrophysical Journal . - IOP Publishing 2008. - Vol. 681 , no. 2 . - P. 1574-1583 . - DOI : 10.1086 / 588186 . - . - arXiv : 0803.1690 .
- ↑ 1 2 LL; Kiss; Szabó, Gy. M .; Bedding, TR Variability in red supergiant stars: Pulsations, long secondary periods and convection noise (Engl.) // Monthly Notices of the Royal Astronomical Society : journal. - Oxford University Press , 2006. - Vol. 372 , no. 4 . - P. 1721 . - DOI : 10.1111 / j.1365-2966.2006.10973.x . - . - arXiv : astro-ph / 0608438 .
- ↑ GA; Gontcharov. Pulkovo Compilation of Radial Velocities for 35,495 Hipparcos stars in a common system (Eng.) // Astronomy Letters: journal. - 2006. - Vol. 32 , no. 11 . - P. 759 . - DOI : 10.1134 / S1063773706110065 . - .
- ↑ 1 2 3 4 Collaboration G. Gaia DR2 - 2018 .-- Vol. 1345.
- ↑ A .; Baudry; Le Squeren, AM; Lepine, JRD The supergiant OH stars S Per and AH SCO - Conditions for OH emission in circumstellar envelopes // Astronomy and Astrophysics : journal. - EDP Sciences 1977. - Vol. 54 . - P. 593 . - .
- ↑ 1 2 NN; Samus; Durlevich, OV et al. VizieR Online Data Catalog: General Catalog of Variable Stars (Samus + 2007-2013) (unknown) // VizieR On-line Data Catalog: B / gcvs. Originally published in: 2009yCat .... 102025S. - 2009 .-- T. 1 . - .
- ↑ 1 2 3 Arroyo-Torres, B .; Wittkowski, M .; Marcaide, JM; Hauschildt, PH The atmospheric structure and fundamental parameters of the red supergiants AH Scorpii, UY Scuti, and KW Sagittarii (Eng.) // Astronomy and Astrophysics : journal. - EDP Sciences 2013. - Vol. 554 . - P. A76 . - DOI : 10.1051 / 0004-6361 / 201220920 . - . - arXiv : 1305.6179 .
- ↑ John R .; Percy; Sato, Hiromitsu. Long Secondary Periods in Pulsating Red Supergiant Stars (English) // Journal of the Royal Astronomical Society of Canada: journal. - 2009. - Vol. 103 . - P. 11 . - .
- ↑ J. Th .; Van loon; Cioni, M.-RL; Zijlstra, AA; Loup, C. An empirical formula for the mass-loss rates of dust-enshrouded red supergiants and oxygen-rich Asymptotic Giant Branch stars ( Astronomy and Astrophysics : journal. - EDP Sciences 2005. - Vol. 438 . - P. 273 . - DOI : 10.1051 / 0004-6361: 20042555 . - . - arXiv : astro-ph / 0504379 .