<i>uvby</i>FCAPT Photometry of the Magnetic Chemically Peculiar Stars 36 Aurigae, HR 2722, 13 Andromedae, and HD 220147

The Four College Automated Photoelectric Telescope obtained differential Stro ¨mgren uvby observations of the magnetic chemically peculiar (mCP) stars HD 20629, HR 3724, 45 Leo, and HD 192678. HD 20629, a moderately large amplitude variable, has a period of 2.9934 days. Analyses of this new photometry with published uvby values show that HR 3724 and 45 Leo had periods of 33.984 and 1.44404 days, respectively, for at least 30 yr. New observations of HD 192678 refine the period of this smallamplitude variable to 6.4193 days.

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uvbyFCAPT Photometry of Six Small‐Amplitude mCP Stars

Adelman¹,

Woodrow²

2007

PUBL ASTRON SOC PAC

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ABSTRACT. If magnetic fields cause elemental abundances to change in the stellar photosphere, then all magnetic chemically peculiar (mCP) stars should exhibit signatures of this effect in both their spectra and flux distributions. Given that all stars rotate, these stars should be magnetic, spectrum, and photometric variables, albeit sometimes of low amplitude. We study differential Strömgren observations from the Four College Automated Photoelectric Telescope (FCAPT) of a Psc, HR 5857, and HR 6709, which are small-amplitude mCP stars, and AB Cet, HD 15890, and HR 8240, which were thought to be near-constant mCP stars, to determine the periods and amplitudes of their photometric variability. We construct the photometric amplitude distribution functions of the mCP stars studied by the first author to obtain statistics on their photometric variability in Strömgren photometry. The star a Psc has a period of 0.74552 days, with its largest amplitude in u of 0.030 mag. The largest amplitude (0.035 mag) for HR 5857 is also for u. We confirmed the period of 1.29957 days found by Hatzes using Doppler imaging. For HR 6709 the largest amplitude observed (0.010 mag) is for u photometry. Its period is 1.20352 days. AB Cet might be minimally variable. HD 15980 appears to be minimally variable, with a period of at least 5 yr. HR 8240 is variable with a b amplitude about 0.05 mag and a period that is several years long. Additional observations of these six stars would be useful to confirm their characteristics. Two apparently constant stars studied with FCAPT Strömgren data, HD 11187 and HD 50169, should be checked to see whether they are long-period variables. If additional observations show their variability, then all mCP stars observed photometrically by the first author with the FCAPT will be found to be variable.

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uvbyFCAPT Photometry of the Magnetic Chemically Peculiar Stars 36 Aurigae, HR 2722, 13 Andromedae, and HD 220147

Cited by 4 publications

References 11 publications

Studies of FCAPTUVBY photometry for the mCP stars HD 32966, HD 35298, HD 68292, HD 93226, HD 171247, HD 217833, HD 220147, and HD 223358

Studies of FCAPTUVBY photometry for the mCP stars HD 32966, HD 35298, HD 68292, HD 93226, HD 171247, HD 217833, HD 220147, and HD 223358

FCAPTuvbyPhotometry of the mCP Stars HD 20629, HR 3724, 45 Leo, and HD 192678

uvbyFCAPT Photometry of Six Small‐Amplitude mCP Stars

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