利用VERA测定大犬座VY的距离
天体物理学
2015-05-13 v1
摘要
我们报告了利用VLBI射电天体测量探测项目（VERA）对红超巨星大犬座VY（VY CMa）周围H2O脉泽的天体测量观测结果。基于13个月的天体测量监测，我们成功测量了0.88 ± 0.08 mas的三角视差，对应距离为1.14 +0.11/-0.09 kpc。这是大犬座VY最精确的距离，也是首次基于周年视差测量的结果。由于先前公认的距离，大犬座VY的光度被高估了。利用我们的结果，我们使用在光学和红外波段上积分的辐射通量，重新估算大犬座VY的光度为(3 ± 0.5) × 10^5 L_sun。这一改进的光度值使得大犬座VY在赫罗图（HR图）上的位置比以往更接近理论允许区域（即林轨迹左侧），尽管恒星表面有效温度的不确定性仍不允许我们做出最终结论。
引用
@article{arxiv.0808.0641,
title = {Distance to VY Canis Majoris with VERA},
author = {Yoon Kyung Choi and Tomoya Hirota and Mareki Honma and Hideyuki Kobayashi and Takeshi Bushimata and Hiroshi Imai and Kenzaburo Iwadate and Takaaki Jike and Seiji Kameno and Osamu Kameya and Ryuichi Kamohara and Yukitoshi Kan-ya and Noriyuki Kawaguchi and Masachika Kijima and Mi Kyoung Kim and Seisuke Kuji and Tomoharu Kurayama and Seiji Manabe and Kenta Maruyama and Makoto Matsui and Naoko Matsumoto and Takeshi Miyaji and Takumi Nagayama and Akiharu Nakagawa and Kayoko Nakamura and Chung Sik Oh and Toshihiro Omodaka and Tomoaki Oyama and Satoshi Sakai and Tetsuo Sasao and Katsuhisa Sato and Mayumi Sato and Katsunori M. Shibata and Yoshiaki Tamura and Miyuki Thushima and Kazuyoshi Yamashita},
journal= {arXiv preprint arXiv:0808.0641},
year = {2015}
}
备注
7 pages, 4 figures, accepted for publication in PASJ, VERA special issue