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arXiv 1812.05511astro-ph.SR
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利用CHARA阵列光学干涉测量O型星的角尺寸和有效温度

Angular Sizes and Effective Temperatures of O-type Stars from Optical Interferometry with the CHARA Array

Kathryn D. Gordon, Douglas R. Gies, Gail H. Schaefer, Daniel Huber, Michael Ireland, D. John Hillier

摘要:

我们提出了六个O-型星的干涉观测与精密天文可见光观测(PAVO)光束组合在中心高角分辨率天文(CHARA)阵列。观测包括三个目标的多个括号,$λ$ ~Ori~A,$ζ$ ~Oph和10~Lac,但只有其他三颗恒星的初步单一观测,$ξ$ ~Per,$α$ ~Cam和$ζ$ ~Ori~A。恒星的角直径从$ζ$ ~Ori~A的0.55毫角秒到10~Lac的0.11质量不等,10~Lac是CHARA阵列所能分辨的最小的恒星。首次直接测量了快速旋转恒星$ζ$ Oph的旋转扁率。我们收集了这些恒星的紫外线到红外线通量测量,然后使用模型大气和有效温度设定的公布结果从分析线光谱得出的角直径和红化估计。基于模型的角直径与观察到的角直径吻合良好。我们还提出了这些恒星的有效温度的估计,通过设置干涉角的大小和拟合分光光度。

英文摘要:

We present interferometric observations of six O-type stars that were made with the Precision Astronomical Visible Observations (PAVO) beam combiner at the Center for High Angular Resolution Astronomy (CHARA) Array. The observations include multiple brackets for three targets, $λ$~Ori~A, $ζ$~Oph, and 10~Lac, but there are only preliminary, single observations of the other three stars, $ξ$~Per, $α$~Cam, and $ζ$~Ori~A. The stellar angular diameters range from 0.55 milliarcsec for $ζ$~Ori~A down to 0.11 mas for 10~Lac, the smallest star yet resolved with the CHARA Array. The rotational oblateness of the rapidly rotating star $ζ$ Oph is directly measured for the first time. We assembled ultraviolet to infrared flux measurements for these stars, and then derived angular diameters and reddening estimates using model atmospheres and an effective temperature set by published results from analysis of the line spectrum. The model-based angular diameters are in good agreement with observed angular diameters. We also present estimates for the effective temperatures of these stars derived by setting the interferometric angular size and fitting the spectrophotometry.

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