鲸鱼座DK
鲸鱼座DK，也称为HD 12039，距离地球135 ly（41 pc），是位于星座鲸鱼座的一颗变星。因为表面磁活动与恒星自转耦合引起的光度变化，它被归类为天龙座BY型变星[10]。它与太阳相似，恒星分类为G4V，表明这是一颗主序星恒星，通过氢的核聚变在其核心产生能量。表面有效温度 5,585K[5]，使恒星呈现黄色。它的质量与太阳差不多，但只发出太阳89%的光度。这是一颗年轻的恒星，年龄估计在750万至800万年之间[11] to 30 million years.[7]。
| 观测资料 历元 J2000 | |
|---|---|
| 星座 | 鲸鱼座 |
| 星官 | |
| 赤经 | 01h 57m 48.97759s[2] |
| 赤纬 | −21° 54′ 05.3411″[2] |
| 视星等（V） | 8.00[3] |
| 特性 | |
| 演化阶段 | 主序星[2] |
| 光谱分类 | G4V[3] |
| 变星类型 | BY Dra |
| 天体测定 | |
| 径向速度 (Rv) | +5.7±0.3[4] km/s |
| 自行 (μ) | 赤经：+103.633[2] mas/yr 赤纬：−50.437[2] mas/yr |
| 视差 (π) | 24.2053 ± 0.0243[2] mas |
| 距离 | 134.7 ± 0.1 ly (41.31 ± 0.04 pc) |
| 绝对星等 (MV) | 5.03[5][6] |
| 详细资料 | |
| 质量 | 1.02[7] M☉ |
| 半径 | 1.0[2] R☉ |
| 表面重力 (log g) | 4.39[2] |
| 亮度 | 0.89[8] L☉ |
| 温度 | 5,585[5][6] K |
| 金属量 [Fe/H] | −0.28[5][6] dex |
| 自转速度 (v sin i) | 15.2[9] km/s |
| 年龄 | 7.5−8[8] Myr |
| 其他命名 | |
| 参考数据库 | |
| SIMBAD | 资料 |
2006年，利用史匹哲太空望远镜的红外观测，在这颗恒星周围的轨道上发现了一个碎片场。这些碎片被认为是一个小行星带，碎片的量测温度为110 K，这使其位于距离恒星4到6AU之间的轨道上，或者与木星绕太阳运行的距离大致相同[12]。这个岩屑盘可能是由一个直径100公里的星子在碰撞中破裂形成的[13]。该恒星系统在70μm处没有显示出任何过量发射，这表明它没有一个冷的外部尘埃盘[14]。
这颗恒星被检查是否存在一颗质量在2-10木星质量范围内、轨道距离为3-15.5AU的太阳系外行星。然而，在2007年，很可能发现了一颗近距离的恒星伴星。此对象与主对象相隔0.15弧秒，因此不太可能是背景天体[15]。
这颗恒星已被提议为杜鹃-时钟座星协（Tuc-Hor）的成员，这是一个在太空中有共同运动的年轻恒星流。这个星协已有3,000万年的年龄[16][17]。 这颗恒星的空间速度分量是[U, V, W] = [−0.6, −16.3, 5.0] km/s[11]。它围绕银河系运行，轨道离心率为0.06，与星系核心的距离在7.11−8.01 kpc之间变化。其轨道的倾斜使其高出银河系平面90秒差距[6]
参考资料
- ^ MAST: Barbara A. Mikulski Archive for Space Telescopes. Space Telescope Science Institute. [8 December 2021].
- ^ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 Vallenari, A.; et al. Gaia Data Release 3. Summary of the content and survey properties. Astronomy & Astrophysics. 2022. arXiv:2208.00211
. doi:10.1051/0004-6361/202243940 . 已忽略未知参数|collaboration=(帮助) Gaia DR3 record for this source at VizieR. - ^ 3.0 3.1 Torres, G. R.; et al. Search for associations containing young stars (SACY). I. Sample and searching method. Astronomy and Astrophysics. December 2006, 460 (3): 695–708. Bibcode:2006A&A...460..695T. S2CID 16080025. arXiv:astro-ph/0609258 . doi:10.1051/0004-6361:20065602.
- ^ Nordström, B.; et al. The Geneva-Copenhagen Survey of the Solar Neighbourhood. Publications of the Astronomical Society of Australia. 2004, 21 (2): 129–133. Bibcode:2004PASA...21..129N. S2CID 123457673. arXiv:0811.3982 . doi:10.1071/AS04013.
- ^ 5.0 5.1 5.2 5.3 Holmberg, J.; Nordstrom, B.; Andersen, J. The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics. Astronomy and Astrophysics. July 2009, 501 (3): 941–947. Bibcode:2009A&A...501..941H. S2CID 118577511. arXiv:0811.3982 . doi:10.1051/0004-6361/200811191.
- ^ 6.0 6.1 6.2 6.3 Detailed Description of V/130. VizieR catalogue service. Centre de Données astronomiques de Strasbourg. [2009-09-07].
- ^ 7.0 7.1 Weidenschilling, S. J. Collisional and Luminosity Evolution of a Debris Disk: The Case of HD 12039. The Astrophysical Journal. October 2010, 722 (2): 1716–1726. Bibcode:2010ApJ...722.1716W. doi:10.1088/0004-637X/722/2/1716 .
- ^ 8.0 8.1 Roccatagliata, V.; et al. Long-wavelength observations of debris discs around sun-like stars. Astronomy and Astrophysics. April 2009, 497 (2): 409–421. Bibcode:2009A&A...497..409R. S2CID 18417944. arXiv:0902.0338 . doi:10.1051/0004-6361/200811018.
- ^ Schröder, C.; Reiners, Ansgar; Schmitt, Jürgen H. M. M., Ca II HK emission in rapidly rotating stars. Evidence for an onset of the solar-type dynamo (PDF), Astronomy and Astrophysics, January 2009, 493 (3): 1099–1107, Bibcode:2009A&A...493.1099S, doi:10.1051/0004-6361:200810377 [永久失效链接]
- ^ Kazarovets, A. V.; et al. The 74th Special Name-list of Variable Stars. Information Bulletin on Variable Stars. 1999, 4659: 1 [2011-11-05]. Bibcode:1999IBVS.4659....1K. （原始内容存档于2018-11-30）.
- ^ 11.0 11.1 Wichmann, R.; Schmitt, J. H. M. M.; Hubrig, S. Nearby young stars. Astronomy and Astrophysics. March 2003, 399 (3): 983–994. Bibcode:2003A&A...399..983W. doi:10.1051/0004-6361:20021867 .
- ^ Hines, Dean C.; et al. The Formation and Evolution of Planetary Systems (FEPS): Discovery of an Unusual Debris System Associated with HD 12039. The Astrophysical Journal. February 20, 2006, 638 (2): 1070–1079. Bibcode:2006ApJ...638.1070H. S2CID 14919914. arXiv:astro-ph/0510294 . doi:10.1086/498929.
- ^ Greaves, Jane; et al. The composition of debris around HD 12039: water from asteroids?. Spitzer Proposal ID #40310. May 2007: 40310. Bibcode:2007sptz.prop40310G.
- ^ Klahr, Hubert; Brandner, Wolfgang. Planet formation: theory, observations and experiments. Cambridge University Press. 2006: 28. ISBN 978-0-521-86015-4.
- ^ Biller, Beth A.; et al. An Imaging Survey for Extrasolar Planets around 45 Close, Young Stars with the Simultaneous Differential Imager at the Very Large Telescope and MMT. The Astrophysical Journal Supplement Series. November 2007, 173 (1): 143–165. Bibcode:2007ApJS..173..143B. doi:10.1086/519925 .
- ^ Zuckerman, B.; Song, Inseok. Young Stars Near the Sun. Annual Review of Astronomy & Astrophysics. 2004, 42 (1): 685–721. Bibcode:2004ARA&A..42..685Z. S2CID 34114530. doi:10.1146/annurev.astro.42.053102.134111.
- ^ Makarov, Valeri V. Unraveling the Origins of Nearby Young Stars. The Astrophysical Journal Supplement Series. March 2007, 169 (1): 105–119. Bibcode:2007ApJS..169..105M. doi:10.1086/509887 .
外部链接
- Spitzer Team Says Debris Disk Could Be Forming Infant Terrestrial Planets. Jet Propulsion Laboratory/Space Science Institute. December 14, 2005 [2011-01-24].