Tomasz Nowakowski is a writer for Phys.org.
Astronomers used the Large Sky Area Multi-Object Fibre Spectroscopic Telescope (LAMOST) to investigate a star. The results of the study suggest that this object is a double-lined system. The paper was published on arXiv.org.
Most of the systems have been detected by the Doppler shifts in their lines. The lines from both stars are visible in some of the observations. The systems are known as double-lined spectroscopic binaries.
TYC 2990-127-1 was initially reported to be a double or multiple star in which two components are separated from each other. One of the stars has a radial velocity of -44.7 km/s and a parallax of approximately 1.43 mas. One study suggested that TYC 2990-127-1 may be an SB2.
The team of astronomer led by Mikhail Kovalev of the Chinese Academy of Sciences presented further evidence that confirms the nature of TYC 2990-127-1.
In this paper, we use the LAMOST medium-resolution spectrum to show that TYC 2990-127-1 is a system of red giant stars and sub-giant stars.
The results show that the primary subgiant is much heavier than the secondary red giant, as their mass was estimated to be 0.76 and 0.16, respectively. The red giant expanded and lost a portion of its mass to the subgiant, according to the astronomer. It was noted that a high mass ratio is typical for the type of system.
The researchers conducted a simulation that supports the scenario. The secondary star is transferring mass to the primary at a rate of 2.5 x 10 -9 solar mass per year. This is consistent with previous works that suggest rapid mass loss.
The prototype member of this class is known asBeta Persei or Algol, and it is a class of binaries. They are semi-detached systems where the less massive component transfers mass to the more massive component due to the filling of the Roche lobe.
The paper states that TYC 2990-127-1 has an orbital period of approximately seven days. The primary and secondary stars had an effective temperature of 5,592 and 4,769 K.
More information: Mikhail Kovalev et al, TYC 2990-127-1: an Algol-type SB2 binary system of subgiant and red giant with a probable ongoing mass-transfer. arXiv:2204.10680v1 [astro-ph.SR], arxiv.org/abs/2204.10680The Science X Network will be launched in 2022.
Citation: TYC 2990-127-1 is an Algol-type double-lined spectroscopic binary, study finds (2022, May 2) retrieved 2 May 2022 from https://phys.org/news/2022-05-tyc-algol-type-double-lined-spectroscopic.html This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.
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