ANALYSIS OF INTERSTELLAR EXTINCTION TOWARDS THE HYPERGIANT CYG OB2 No. 12

被引：0

作者：

Maryeva, O. V. ^{[1
]}

Chentsov, E. L. ^{[1
]}

Goranskij, V. P. ^{[2
]}

Karpov, S. V. ^{[1
,3
]}

机构：

[1] Russian Acad Sci, Special Astrophys Observ, Nizhnii Arkhyz 369167, Russia

[2] Moscow MV Lomonosov State Univ, Sternberg Astron Inst, Univ Sky Pr 13, Moscow 119992, Russia

[3] Kazan Volga Reg Fed Univ, Kremlevskaya Str 18, Kazan 420008, Russia

来源：

BALTIC ASTRONOMY | 2016年 / 25卷 / 01期

关键词：

stars:; early-type; atmospheres; fundamental parameters; Galaxy: open clusters and associations: individual (Cyg OB2); individual:; MT; 304; 343; 282; MASSIVE STARS; ASSOCIATION; SPECTROSCOPY; POPULATION; SPECTRUM; SCORPIO;

D O I：

暂无

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The Cyg OB2 stellar association hosts an entire zoo of unique objects, and among them an enigmatic star Cyg OB2 No.12 (Schulte 12, MT 304). MT 304 is enigmatic not only due to its highest luminosity (according to various estimates, it is one of the brightest stars in the Galaxy), but also because its reddening is anomalously large, greater than the mean reddening in the association. To explain the nature of anomalous reddening (A(V) similar or equal to 10 mag) of MT 304, we carried out spectrophotometric observations of 25 stars located in its vicinity. We mapped interstellar extinction within the 2.5 arcmin radius and found it to increase towards MT 304. According to our results, the two most reddened stars in the association after MT 304 are J203240.35+411420.1 and J203239.90+411436.2, both located about 15 arcsec from it. Interstellar extinction A(V) towards these stars is about 9 mag. Our results favor the hypothesis of the circumstellar nature of reddening excess. In the second part of the paper we present the results of our modeling of MT 282 (B1 IV) and MT 343 (B1 V), which belong to the older population of the association and have ages greater than 10 Myr.

引用

页码：42 / 48

页数：7

共 36 条

[1] On the Nature of Anomalous Reddening of the Hypergiant Cygnus OB2 #12
Maryeva, O. V.
Chentsov, E. L.
Goranskij, V. P.
Dyachenko, V. V.
Karpov, S. V.
STARS: FROM COLLAPSE TO COLLAPSE, 2017, 510 : 187 - 191
[2] On the nature of high reddening of Cygnus OB2 #12 hypergiant
Maryeva, O. V.
Chentsov, E. L.
Goranskij, V. P.
Dyachenko, V. V.
Karpov, S. V.
Malogolovets, E. V.
Rastegaev, D. A.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2016, 458 (01) : 491 - 507
[3] On the Status of the Star Schulte 12 in the Association Cyg OB2
Klochkova, V. G.
Islentieva, E. S.
Panchuk, V. E.
ASTRONOMY REPORTS, 2022, 66 (11) : 998 - 1007
[4] A new Bok globule towards Cygnus OB2 No. 12
Poppi, Sergio
Scappini, Flavio
Cecchi-Pestellini, Cesare
Maccaferri, Giuseppe
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2010, 407 (02) : 1255 - 1258
[5] On the Status of the Star Schulte 12 in the Association Cyg OB2
V. G. Klochkova
E. S. Islentieva
V. E. Panchuk
Astronomy Reports, 2022, 66 : 998 - 1007
[6] Infrared spectroscopy of dust in the diffuse interstellar medium toward Cygnus OB2 No. 12
Whittet, DCB
Boogert, ACA
Gerakines, PA
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vanDishoeck, EF
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ASTROPHYSICAL JOURNAL, 1997, 490 (02) : 729 - 734
[7] Quest for the tertiary component in Cyg OB2 #5
Rauw, Gregor
Naze, Yael
Campos, Fran
ASTRONOMY & ASTROPHYSICS, 2019, 627
[8] An analysis of HST UV spectra of Cyg OB2 stars
Herrero, A
Puls, J
Corral, LJ
Kudritzki, RP
Villamariz, MR
ASTRONOMY & ASTROPHYSICS, 2001, 366 (02): : 623 - 635
[9] MODELING THE RADIO EMISSION FROM Cyg OB2 NO. 5: A QUADRUPLE SYSTEM?
Kennedy, M.
Dougherty, S. M.
Fink, A.
Williams, P. M.
ASTROPHYSICAL JOURNAL, 2010, 709 (02) : 632 - 643
[10] Investigation of the brightest stars in the Cyg OB2 association
Maryeva, Olga
Parfenov, Sergey
NEW WINDOWS ON MASSIVE STARS: ASTEROSEISMOLOGY, INTERFEROMETRY AND SPECTROPOLARIMETRY, 2014, 307 : 119 - 120

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