Photometric recalibration of VPHAS plus u-band photometry with the stellar colour regression method and Gaia DR3

被引：0

作者：

Chen, Bing-Qiu ^{[1
]}

Yuan, Hai-Bo ^{[2
,3
]}

Huang, Bo-Wen ^{[2
,3
]}

机构：

[1] Yunnan Univ, South Western Inst Astron Res, Kunming 650500, Peoples R China

[2] Beijing Normal Univ, Inst Frontiers Astron & Astrophys, Beijing 102206, Peoples R China

[3] Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2024年 / 530卷 / 03期

基金：

国家重点研发计划; 中国国家自然科学基金;

关键词：

techniques: photometric; catalogues; stars: fundamental parameters; DIGITAL SKY SURVEY; FLUX CALIBRATION; BATC SURVEY; IMPROVEMENT; PARAMETERS; LAMOST; STARS;

D O I：

10.1093/mnras/stae1104

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The u-band magnitude is vital for determining stellar parameters and investigating specific astronomical objects. However, flux calibration in the u band for stars in the Galactic disc presents significant challenges. In this study, we introduce a comprehensive recalibration of u-band photometric magnitudes of the VPHAS+ Data Release 4, employing the stellar colour regression technique. By leveraging the expansive set of XP spectra and GBP photometry from Gaia Data Release 3, as well as the individual stellar extinction values provided by the literature, we have obtained precise model magnitudes of nearly 3 million stars. Our analysis identifies systematic magnitude offsets that exhibit a standard deviation of 0.063 mag across different observational visits, 0.022 mag between various CCDs, and 0.009 mag within pixel bins. We have implemented precise corrections for these observational visits, CCD chips, and pixel bins-dependent magnitude offsets. These corrections have led to a reduction in the standard deviation between the observed magnitudes and the model magnitudes from 0.088 to 0.065 mag, ensuring that the calibrated magnitudes are independent of stellar magnitude, colour, and extinction. The enhanced precision of these magnitudes substantially improves the quality of astrophysical research and offers substantial potential for furthering our understanding of stellar astrophysics.

引用

页码：3228 / 3239

页数：12

共 45 条

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