I'm currently working on SRc Alf Ori and its Bolometric Magnitudes. I do have the light curve estimates (From AAVSO but the SDSS doesn't seem to have an available data set for Alf Ori) and I'm wondering if I can utilize the V-band optical photometric band to obtain the MBOL assuming that I got the adopted values of Teff, R and Distance D?
If so, is there a program/software/inlist that I can use to get those?
Recommendations/suggestions are highly accepted.
Best regards,
Generich Capuli | CGHA
"SDSS doesn't seem to have an available data set for Alf Ori" For the most part, SDSS avoids the Galactic plane. And Alf Ori (Betelgeuse) is too bright anyway - it would saturate the SDSS detectors. "I'm wondering if I can utilize the V-band optical photometric band to obtain the MBOL assuming that I got the adopted values of Teff, R and Distance D?" It is a pulsating variable; its spectral type (proportional to Teff) and radius (R) both change as it varies. So one adopted value of Teff and R would not suffice. The other difficulty is disentangling intrinsic luminosity variations from variations in extinction along the line of sight. The big decrease in its optical brightness over winter 2019-2020 has been attributed to the latter reason. So I think that the project you are describing needs spectra, or at least multi-band time-series photometry, to fit models yielding spectral type and extinction, independent of external assumptions of Teff, R and extinction. (There have been some direct estimates of R from adaptive optics and interferometric observations, but you would need them to coincide in time with your photometric data).
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