A study of excess H-alpha emission in chromospherically active M dwarf

Journal Article · Fri Sep 01 00:00:00 EDT 1989 · Astrophysical Journal; (USA)

DOI:https://doi.org/10.1086/167810· OSTI ID:5251126

Young, A; Skumanich, A; Stauffer, J R; Harlan, E; Bopp, B W ^[1]

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1. San Diego State Univ., CA (USA)

Spectroscopic observations from three observatories are combined to study the properties of the excess H-alpha emission which characterizes the most chromospherically active subset of the M dwarf stars, known as the dMe stars. It is demonstrated that the excess H-alpha luminosity from these stars is a monotonically decreasing function of their (R-I) color, and evidence is presented which suggests that the product of the mean surface brightness and the mean filling factor of the emissive regions is essentially constant with color. Another significant result of the study is a linear correlation between the excess luminosity in H-alpha and the coronal X-ray luminosity. 39 refs.

• OSTI ID: 5251126
• Journal Information: Astrophysical Journal; (USA), Vol. 344; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
DWARF STARS
EMISSION SPECTRA
BALMER LINES
COLOR
LINE WIDTHS
LUMINOSITY
STELLAR ACTIVITY
STELLAR CHROMOSPHERES
STELLAR CORONAE
STELLAR RADIATION
X RADIATION
ATMOSPHERES
ELECTROMAGNETIC RADIATION
IONIZING RADIATIONS
OPTICAL PROPERTIES
ORGANOLEPTIC PROPERTIES
PHYSICAL PROPERTIES
RADIATIONS
SPECTRA
STARS
STELLAR ATMOSPHERES
640102* - Astrophysics & Cosmology- Stars & Quasi-Stellar
Radio & X-Ray Sources