Trigonometric Parallaxes of Massive Star Forming Regions: G012.88+0.48 and W33

Дата и время публикации : 2013-04-07T18:55:33Z

Авторы публикации и институты :
K. Immer
M. J. Reid
K. M. Menten
A. Brunthaler
T. M. Dame

Ссылка на журнал-издание: Ссылка на журнал-издание не найдена
Коментарии к cтатье: 9 pages, 11 figures, 2 tables; accepted for publication at A&A
Первичная категория: astro-ph.GA

Все категории : astro-ph.GA

Краткий обзор статьи: We report trigonometric parallaxes for water masers in the G012.88+0.48 region and in the massive star forming complex W33 (containing G012.68–0.18, G012.81–0.19, G012.90–0.24, G012.90–0.26), from the Bar and Spiral Structure Legacy (BeSSeL) survey using the Very Long Baseline Array. The parallax distances to all these masers are consistent with $2.40^{+0.17}_{-0.15}$ kpc, which locates the W33 complex and G012.88+0.48 in the Scutum spiral arm. Our results show that W33 is a single star forming complex at about two-thirds the kinematic distance of 3.7 kpc. The luminosity and mass of this region, based on the kinematic distance, have therefore been overestimated by more than a factor of two. The spectral types in the star cluster in W33,Main have to be changed by 1.5 points to later types.

Category: Physics