(ESO プレスリリース) First ever binary star found near our galaxy’s supermassive black hole (2024-12-17) https://www.eso.org/public/news/eso2418/
This new discovery shows that some binaries can briefly thrive, even under destructive conditions.
D9, as the newly discovered binary star is called, was detected just in time: it is estimated to be only 2.7 million years old, and the strong gravitational force of the nearby black hole will probably cause it to merge into a single star within just one million years, a very narrow timespan for such a young system.
(Nature) A binary system in the S cluster close to the supermassive black hole Sagittarius A* (2024-12-17) https://www.nature.com/articles/s41467-024-54748-3
The binary system is stable against the disruption by Sgr A* due to the semi-major axis of the secondary being 1.59±0.01 au, which is well below its tidal disruption radius of approximately 42.4 au.
distance of the D9 system from Sgr A* of 29.9 mpc (0.75 arcseconds)
With an eccentricity of 0.32 and a semi-major axis of 44 mpc, D9 qualifies as an S cluster member with orbital parameters comparable to other S stars.
(動画) First ever binary star found near Sgr A* | ESO News (2024-12-18) https://www.youtube.com/watch?v=SQVG7pqcHTc
Sgr A* 近傍、S クラスター内に連星系 by ヨーロッパ南天天文台 (スコア:3, 興味深い)
(ESO プレスリリース)
First ever binary star found near our galaxy’s supermassive black hole (2024-12-17)
https://www.eso.org/public/news/eso2418/
This new discovery shows that some binaries can briefly thrive, even under destructive conditions.
D9, as the newly discovered binary star is called, was detected just in time: it is estimated to be only 2.7 million years old,
and the strong gravitational force of the nearby black hole will probably cause it to merge into a single star within just one million years, a very narrow timespan for such a young system.
(Nature)
A binary system in the S cluster close to the supermassive black hole Sagittarius A* (2024-12-17)
https://www.nature.com/articles/s41467-024-54748-3
The binary system is stable against the disruption by Sgr A* due to the semi-major axis of the secondary being 1.59±0.01 au, which is well below its tidal disruption radius of approximately 42.4 au.
distance of the D9 system from Sgr A* of 29.9 mpc (0.75 arcseconds)
With an eccentricity of 0.32 and a semi-major axis of 44 mpc, D9 qualifies as an S cluster member with orbital parameters comparable to other S stars.
(動画)
First ever binary star found near Sgr A* | ESO News (2024-12-18)
https://www.youtube.com/watch?v=SQVG7pqcHTc
(Nature ASIA)
天の川銀河の超大質量ブラックホールの近くに連星系を発見 (2024-12-18)
https://www.natur
Re:Sgr A* 近傍、S クラスター内に連星系 by ヨーロッパ南天天文台 (スコア:2)
記事を読み返して、どうも Sgr A* からの距離が想像しにくかったのでググって比較してみた。
大きい方から。
同じオーダーで比べてもいまいち把握できない感じ。
オールト雲くらいの大きさの中に、恒星・連星（・ブラックホール連星）・星間雲なんかがたくさん入ってる。と考えれば確かにすごい。