Measuring the Rotational Speeds of Classical Be Stars with IR Excess

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沈沛旻(Pei-Min Shen) 查詢紙本館藏

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天文研究所

論文名稱

(Measuring the Rotational Speeds of Classical Be Stars with IR Excess)

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摘要(中)

Classical Be stars為B型恆星且擁有紅外超量和光譜上存在著發射線的特性。這些恆星與主序前Herbig Ae/Be stars 不同，他們為轉速相當快的恆星且可能有些恆星轉速接近break-up。在星球附近有氣態環星盤，而這個環星盤可以解釋許多觀測的特性，包含了在被拋出物質所形成的envelope中的塵埃凝聚。我們利用NARIT所屬的泰國望遠鏡(TNT)取得echelle spectra，來算HD50138 (90.9±5.0 km/s)，HD 45677 (84.3±5.6 km/s) ，和HD 62532 (293.6±9.5 km/s)三顆Classical Be stars的轉速(vsini)。我們也估計了儀器所造成的譜寬，但是這些星球旋轉相當的快，所以我們預期儀器所造成的譜寬效應相對很小。在本篇論文我們討論星球轉速與Be phenomena之間有無任何關係。

摘要(英)

Classical Be stars are B-type stars with the characteristic emission spectra and infrared excess. These stars are distinct from the pre-main sequence Herbig Ae/Be stars and are known to be rapid rotators, some perhaps close to break-up. They are surrounded by gaseous disks, which are responsible for many of the observed properties, including plausibly the dust condensation in the ejected cooling envelopes. We present the echelle spectra taken by Tai National Telescope(TNT) of NARIT to derive the projected rotational speed (vsini) of three classical Be stars, HD50138 (90.9±5.0 km/s), HD 45677 (84.3±5.6 km/s), and HD 62532 (293.6±9.5 km/s). We are in the process of estimating the instrumental broadening, but these stars rotate very fast, so we expect the effect to be relatively small. We discuss how fast rotation may have played a role in the Be phenomena.

關鍵字(中)

★ 星球
★ 星球轉速
★ 恆星演化
★ 光譜
★ 紅外超量

關鍵字(英)

★ rotational velocity
★ classical Be star
★ echelle spectra
★ IR excess
★ stellar evolution

論文目次

Contents
1. Introduction 1
1.1 Classification of Be Stars 2
1.2 Stellar Rotation 3
1.3 IR Excess v.s. Stellar Rotation 4

2. Observations and Data Reduction 5
2.2 Echelle Spectrograph & Observations 5
2.2 Data Reduction 6
2.3 Estimating the Stellar Rotation & Results 6
3. Discussion 12

3.1 Previous Studies of our Targets 12
3.1.1 HD 50138 12
3.1.2 HD 45677 13
3.1.3 HD 62532 14
3.2 Stellar Rotation & Color Excess 14
4. Conclusion 19
Bibliography 20
Appendix A 22
Appendix B 42

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指導教授

陳文屏(Wen-Ping Chen)

審核日期

2014-7-25

推文