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Journals / Physics and Astronomy Reports / 2026 / Volume: 4 Issue: 1

Spectroscopic Bolometric Corrections and Empirical Zero-point Constants of Gaia Magnitudes, 𝐺, 𝐺BP, and 𝐺RP, from Gaia XP Spectra

Zeki Eker(AKDENIZ UNIVERSITY)0000-0003-1883-6255
Gökhan Yücel(AKDENIZ UNIVERSITY)0000-0002-9846-3788
Pages
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Publication Date
2026-06-17
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

Lastly, spectroscopic 𝐵𝐶s for Gaia magnitudes of 88 stars and the spectroscopic 𝐵𝐶 − 𝑇eff relation for each Gaia filter are presented.

📌 3 Key Takeaways

🎯
Objective & Hypothesis:The International Astronomical Union 2015 Resolution B2 (IAU2015GARB2) has resolved the long-standing problem of zeropoint constants for the absolute and apparent bolometric magnitude scales and opened a new window in fundamental astrophysics.
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Key Findings & Data:The empirical zero-point constants of the bolometric corrections, 𝐶2 (𝜉), and the absolute/apparent magnitudes, 𝐶𝜉 /𝑐 𝜉 , for the Gaia passbands were obtained from 88 Gaia XP spectra, and absolute bolometric/filtered magnitudes.
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Conclusion & Impact:Lastly, spectroscopic 𝐵𝐶s for Gaia magnitudes of 88 stars and the spectroscopic 𝐵𝐶 − 𝑇eff relation for each Gaia filter are presented.
🔬Design:Research Article
📍Scope:2015 Verileri
⚙️Variables:Stellar fundamental parameters · Sun · Bolometric magnitude

Abstract

The International Astronomical Union 2015 Resolution B2 (IAU2015GARB2) has resolved the long-standing problem of zeropoint constants for the absolute and apparent bolometric magnitude scales and opened a new window in fundamental astrophysics. The empirical zero-point constants of the bolometric corrections, 𝐶2 (𝜉), and the absolute/apparent magnitudes, 𝐶𝜉 /𝑐 𝜉 , for the Gaia passbands were obtained from 88 Gaia XP spectra, and absolute bolometric/filtered magnitudes. The individual zero-point constants ⟨𝐶2⟩ of the bolometric corrections (𝐵𝐶𝜉 ) for each star revealed weighted averages of ⟨𝐶2 (𝐺)⟩ = 0.8677 ± 0.0109 mag, ⟨𝐶2 (𝐺BP)⟩ = 1.0449 ± 0.0116 mag, and ⟨𝐶2 (𝐺RP)⟩ = 2.0510 ± 0.0087 mag. Furthermore, 𝐶Bol = 71.197425... mag and 𝑐Bol = −18.997351...mag announced by IAU2015GARB2, and using the definition of 𝐶2 = 𝐶Bol − 𝐶𝜉 = 𝑐Bol − 𝑐 𝜉 , where the subscript 2 indicate the wavelength ranges of two in which one is for bolometric and the other for one of the three filters, the zero-point constants of magnitudes for Gaia filters as 𝐶G = 70.1525 ± 0.0109 mag and 𝑐G = −19.8651 ± 0.0105 mag, 𝐶GBP = 70.1525±0.0116 mag and 𝑐GBP = −20.0423±0.0116 mag, and𝐶GRP = 69.1464±0.0087 mag and 𝑐GRP = −21.0484±0.0087 mag, if 𝐿𝜉 and 𝑓𝜉 are in SI units, assuming no extinction. Lastly, spectroscopic 𝐵𝐶s for Gaia magnitudes of 88 stars and the spectroscopic 𝐵𝐶 − 𝑇eff relation for each Gaia filter are presented.

🔖

Cite This Article

Eker, Z., Yücel, G. (2026). Spectroscopic Bolometric Corrections and Empirical Zero-point Constants of Gaia Magnitudes, 𝐺, 𝐺BP, and 𝐺RP, from Gaia XP Spectra. Physics and Astronomy Reports, Volume: 4 Issue: 1. https://doi.org/10.26650/PAR.2026.00004

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