AT2017fvz: a nova in the dwarf irregular galaxy NGC6822

被引：2
作者：
Healy, M. W. [1 ]
Darnley, M. J. [1 ]
Copperwheat, C. M. [1 ]
Filippenko, A. V. [2 ,3 ]
Henze, M. [4 ]
Hestenes, J. C. [2 ]
James, P. A. [1 ]
Page, K. L. [5 ]
Williams, S. C. [6 ]
Zheng, W. [2 ]
机构：
[1] Liverpool John Moores Univ, Astrophys Res Inst, Liverpool L3 5RF, Merseyside, England
[2] Univ Calif Berkeley, Dept Astron, 601 Campbell Hall, Berkeley, CA 94720 USA
[3] Univ Calif Berkeley, Miller Inst Basic Res Sci, Berkeley, CA 94720 USA
[4] San Diego State Univ, Dept Astron, San Diego, CA 92182 USA
[5] Univ Leicester, Dept Phys & Astron, Xray & Observat Astron Grp, Leicester LE1 7RH, Leics, England
[6] Lancater Univ, Phys Dept, Lancaster LA1 4YB, England
来源：
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2019年 / 486卷 / 03期
基金：
英国科学技术设施理事会;
关键词：
stars: individual: (AT 2017fvz); novae; cataclysmic variables; OBSERVATORY SUPERNOVA SEARCH; INFRARED PHOTOMETRY; STELLAR PHOTOMETRY; LIGHT CURVES; NGC-6822; DISTANCE; PROGRAM; MODELS; STARS; HI;
D O I：
10.1093/mnras/stz1108
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
A transient in the Local Group dwarf irregular galaxy NGC6822 (Barnard's Galaxy) was discovered on 2017 August 2 and is only the second classical nova discovered in that galaxy. We conducted optical, near-ultraviolet, and X-ray follow-up observations of the eruption, the results of which we present here. This 'very fast' nova had a peak V-band magnitude in the range -7.41 > M-V >-8.33 mag, with decline times of t(2,V) = 8.1 +/- 0.2 d and t(3,V) = 15.2 +/- 0.3 d. The early- and late-time spectra are consistent with an Fe II spectral class. The Ha emission line initially has a full width at half-maximum intensity of similar to 2400 km s(-1) - a moderately fast ejecta velocity for the class. The Ha line then narrows monotonically to similar to 1800 km s(-1) by 70 d post-eruption. The lack of a pre-eruption coincident source in archival Hubble Space Telescope imaging implies that the donor is a main-sequence, or possibly subgiant, star. The relatively low-peak luminosity and rapid decline hint that AT 2017fvz may be a 'faint and fast' nova.
引用
收藏
页码：4334 / 4347
页数：14
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