000007932 001__ 7932
000007932 005__ 20260211164943.0
000007932 0247_ $$2DOI$$a10.1093/mnras/staf618
000007932 037__ $$aSCART-2026-0095
000007932 100__ $$aRadley, Isaac C. 
000007932 245__ $$aA photometric comparison of B and Be stars using Gaia DR3
000007932 260__ $$c2025
000007932 520__ $$aPrevious studies have observed significant photometric differences between non-emission B-type and classical Be stars, however the precise mechanism responsible for these differences is unclear. This study combines the Bright Star Catalogue with Tycho and Gaia photometry to create a homogeneous sample of 1015 of the closest and brightest B and Be-type field stars with 90 per cent of objects at distances < 500 pc. Due to their proximity, the extinction towards these objects is very low, ensuring we minimize any obfuscation in the reddening correction and final photometry. We present our findings in both Tycho and Gaia photometry through colour magnitude diagrams and present intrinsic colours and absolute magnitudes for each spectral type. We find Be stars are on average ∼ 0.5 mag brighter in both Gaia G and Tycho VT compared to non-emission B stars of the same spectral type. Additionally, we find tentative evidence that Be stars are redder in Gaia Bp−Rp, particularly for the earlier types, but have similar Tycho BT−VT colours. We test the effects of gravitational darkening due to rapid rotation and binarity on the photometry of our sample and find both to be insufficient to explain the observed photometric differences between B and Be stars. We conclude that the most likely mechanism responsible for the observed photometric differences is the combined effect of the circumstellar disc and stellar evolution up the main sequence, with the disc dominating early-types and evolution dominating late type stars.
000007932 594__ $$aNO
000007932 6531_ $$astars: circumstellar matter 
000007932 6531_ $$astars: emission-line, Be 
000007932 6531_ $$astars: fundamental parameters 
000007932 6531_ $$aHertzprung–Russell and colour–magnitude diagrams
000007932 700__ $$aOudmaijer, René D. 
000007932 700__ $$aVioque, Miguel 
000007932 700__ $$aDodd, Jonathan M.
000007932 773__ $$cpp. 196401976$$n3$$pMonthly Notices of the Royal Astronomical Society$$v539$$y2025
000007932 8560_ $$frene.oudmaijer@ksb-orb.be
000007932 85642 $$ahttps://watermark02.silverchair.com/staf618.pdf?token=AQECAHi208BE49Ooan9kkhW_Ercy7Dm3ZL_9Cf3qfKAc485ysgAAA1YwggNSBgkqhkiG9w0BBwagggNDMIIDPwIBADCCAzgGCSqGSIb3DQEHATAeBglghkgBZQMEAS4wEQQMbRgrbiQ3E1nLw71kAgEQgIIDCc2NZNrmUaMB_2WBPv5xz3PlzR6U5t6McUAJMVBMmNIAqWzzfjsvNN4Wm1CLx6nrfCQrr_kww4qxrbCvDeNADQpkj5H2JrRYKZ0b1x50DIAJfFJS46DgEUcCQknWkg-OPjCFwEd3Phyg4sM5TNYu8oOX6ygQ7s2d2kndq6WPWrDIQ4F4UePtL6nXJsEDvUwxsmR0427oZ1B67hFyI35KtQRgRRokO3E20_NqI3kDi4iP7-tJdzEtEKM6NfFZ-XsLFBNglkvHo4LZSph8BeNRJSjLAIQSH0UICs-R3xYxB4eqaHY53yJ6h8u2hg_wyToCHGV_HpFYW9pl8mCKRmkfVJZ5C4DkxDBBJ811MobAoE6RWV-kqxOBJWuQIzt02UuByGWksvGWQPH-sGePhftI9ayOVhyE_NmdMP95J2ICcNxqtMlVzG6P4sw7pVU2uzPQlHLc74iODFcq1rE3jHBqkbhPjuVrphKM9uMk2osv9RPpTL3t29jxnPixS60WIQA-13jttGDDr5fufoh0nSrrCf85HBuBUa0CG43uOjcFyNmxUrRv1dBoYykb0fL0l4R7zd_1tV0giFAP1Va0kp2To_jOoYn2jVqyDFd8EKOm_BVxVNFWAL3xjb-xTfsplvIdOe1kTZKlqfEUZ2WUatBGPDLZg6Mv8h0IyExSkGFJ_sVW3aUxC3P-zg9EHjxP_38cUza9CccvFVsHp5M_Yy7v5quWwWv4tZTBwYJMP78QdI76QZQVvbEARERefzx_ckjyTpFtP232PqFTeyABSkt1tA37sM6Hk12Tt8TGYUxUOMH9ObZbHeVB5_mqbL-epdjvwYzNyYnRdAA3a40ZOqnvlhqYk_hPnWXYGiwHLhWYW8sbW5wzlZoMbFDbfApvnD2ZN43ioY6ptIN18g46RaEBjRmgf3MWiII8cixmm9DXT33rCiC7HcOH09_6aqfER3XrbcTFSg95qzu65NOHfZT253wvqKDBvtlY-SBWQBJtnfUD8Y6l7H76bTk9qT9hiYKXPqZ-Zm2X8iGWAw
000007932 905__ $$apublished in
000007932 980__ $$aREFERD