利用红团簇星测定超新星遗迹距离

Subjects: Astronomy >> Astrophysical processes submitted time 2023-06-07 Cooperative journals: 《天文学进展》

雷贤欢1,2，朱 辉1，单素素1,2，张海燕1,3,4，田文武1,2

Abstract： Supernova remnant is an important source of the interstellar medium, and im#2;portant mediation to understand the mechanisms of supernova explosions, the acceleration of Galactic Cosmic-Rays, and the abundance of chemical elements in the interstellar medi#2;um. An accurate measurement of the distance to an SNR can better constrain other physical parameters of the SNR. However, reliable distance measurement of SNRs is very challenging. Up to now, in the confirmed SNRs and newly discovered SNR candidates, about one-third of them have reliable distance measurements. Generally, there are three main methods to measure SNRs’ distance: kinematic method, radio-surface-brightness-to-diameter relation and extinction-distance map. In recent years, based on the principle of extinction-distance relation, the method of measuring SNR’s distances using red clump (RC) as probe has been well developed and applied. RCs are a kind of low-mass stars in the burning stage of the helium nuclei. Their absolute luminosity and dispersion are small, so they can be easily identified. Therefore, they are often used as standard candles to measure the distance of other celestial bodies. This paper will first introduce the current progress in SNR distance measurement, then will summarize the achievement using the RCs method.

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