首页     开始     To Survive in the Universe    
Inhabited Sky
    News@Sky     天文图片     收集     论坛     Blog New!     常见问题     新闻     登录  

HD 161628


目录

图像

上传图像

DSS Images   Other Images


相关文章

Near-infrared integral-field spectroscopy of the companion to GQ Lupi
Context: The first substellar companion of possibly planetary massaround a normal star, GQ Lup, has been directly imaged (Neuhäuseret al. 2005, A&A, 435, L13). Besides the unknown formation history,the mass of such an object is a criterion to decide about its truenature. Aims: We aim to determine the physical properties of the GQ Lupcompanion - effective temperate (T_eff) and surface gravity (log{g}),and thus its mass independently from evolutionary models. Methods: Weuse the adaptive optics integral-field spectrograph SINFONI at the VLTfor near-infrared spectroscopy from 1.1 to 2.5 μm with a resolutionof R = 2500-4000. We compare these spectra with synthetic atmosphericmodels (GAIA v2.0 cond). Results: From the complete set of spectra wefind a consistent effective temperature and surface gravity of T_eff =2650 ± 100 K and log{g} = 3.7 ± 0.5 dex. Combined with aslightly revised luminosity of log{L/Lȯ} = -2.25± 0.24 dex for the companion, we determine a radius of R =3.50+1.50-1.03 {R_Jup} and thus a mass of 25{M_Jup}. The uncertainty of this value is rather high. Due to the largeuncertainty of the surface gravity, the mass could range from 4 to 155{M_Jup}. By comparing the paramaters of the companion of GQ Lup to theones of 2MASS J05352184-0546085, published by Stassunet al. (2006, Nature, 440, 311), we conclude that the companion to GQLup A has a mass lower than 36 ± 3 {M_Jup}.Based on observations collected at the European Southern Observatory,Chile, in programmes 275.C-5033(A) and 077.C-0264(A).

Far-Ultraviolet Stellar Photometry: Fields Centered on rho Ophiuchi and the Galactic Center
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1996ApJS..104..101S&db_key=AST

Walraven photometry of nearby southern OB associations
Homogeneous Walraven (VBLUW) photometry is presented for 5260 stars inthe regions of five nearby southern OB associations: Scorpio Centaurus(Sco OB2), Orion OB1, Canis Major OB1, Monoceros OB1, and Scutum OB2.Derived V and (B - V) in the Johnson system are included.

提交文章


相关链接

  • - 没有找到链接 -
提交链接


下列团体成员


观测天体数据

星座:天蠍座
右阿森松:17h48m15.08s
赤纬:-35°53'43.1"
视星:7.094
距离:210.526 天文距离
右阿森松适当运动:-11.7
赤纬适当运动:-25.8
B-T magnitude:7.039
V-T magnitude:7.09

目录:
适当名称   (Edit)
HD 1989HD 161628
TYCHO-2 2000TYC 7389-1805-1
USNO-A2.0USNO-A2 0525-29609942
HIPHIP 87140

→ 要求更多目录从vizier