Variations of the Ap star HDE 318107 ? , ? ?
نویسنده
چکیده
The rotation period of the Ap star HDE 318107 has been determined from magnetic and photometric observations obtained between August 1992 and September 1998.
منابع مشابه
مطالعه نورسنجی و طیف سنجی ستارهCyg V1584
UBV photometric observations of Ap star Cyg V1584 have been presented. To find the rotational period of the star, a sinusoidal wave function has been fitted to the noramal points of UBV filters. Assuming that a circular hot spot located at the magnetic pole of the star is responsible for the observed light variations, both physical an geometrical parameters of the spot have been determined. F...
متن کاملAstronomy & Astrophysics Properties of galactic B [ e ] supergiants II . HDE 327083
The emission-line object HDE 327083 has long been considered to be one of the most luminous stars in the Milky Way. Nevertheless, no reliable physical parameters have been published for it. Our high-resolution optical spectroscopy revealed the presence of photospheric lines of a cool luminous companion. We detected significant antiphased radial velocity variations of the emission and absorption...
متن کاملVariations of the Ap star HD 208217 ?
We present a new determination of the rotation period of the Ap star HD 208217 based on photometric and magnetic measurements. The variations of this star are remarkable by the strong anharmonicity of its lightcurves in all colours as well as by the double wave of its mean magnetic field modulus variations.
متن کاملAn optical and near - IR spectroscopic study of the extreme P Cygni - type supergiant HDE 316285
A detailed study of the Galactic P Cygni-type supergiant HDE 316285, based on high quality optical (AAT, MSO, CTIO) and near-IR (UKIRT, CFHT, CTIO) spectroscopy, is presented. As has been noted previously, its spectrum is dominated by H, He i, and Fe ii P Cygni profiles. Emission lines due to N i, N ii, [N ii], O i, Na i, Mg ii, Al ii, Ca ii, Si ii, Si iii, Fe ii and [Fe ii] can also be readily...
متن کاملMaresin-1 reduces the pro-inflammatory response of bronchial epithelial cells to organic dust
BACKGROUND Exposure to organic dust causes detrimental airway inflammation. Current preventative and therapeutic measures do not adequately treat resulting disease, necessitating novel therapeutic interventions. Recently identified mediators derived from polyunsaturated fatty acids exhibit anti-inflammatory and pro-resolving actions. We tested the potential of one of these mediators, maresin-1 ...
متن کامل