The 1st measurement of the Lyman continuum emission from normal stars

M.G. Hoare; J.E. Drew; M. Denby

The 1st measurement of the Lyman continuum emission from normal stars

M.G. Hoare, J.E. Drew, M. Denby

Research output: Contribution to journal › Article › peer-review

Abstract

We report the first measurements of Lyman continuum emission from non-degenerate stars. The Wide Field Camera on-board ROSAT detected strong emission from Beta CMa (B1 II-III) and Epsilon CMa (B2 II). Both Kurucz LTE line-blanketed and Mihalas NLTE unblanketed model atmospheres can match the observed count rate for Beta CMa within the known constraints on T(eff) and N(H). For Epsilon CMa, we find that the interstellar column must be at most 9 x 10 exp 17/sq cm, and probably much lower still, to explain the very strong EUV flux. We also find marginal evidence for regular variability in the Lyman continuum emission for Beta CMa, but not at the dominant period of the known optical pulsations.

Original language	English
Pages (from-to)	L19-L22
Journal	Monthly Notices of the Royal Astronomical Society
Volume	262
Issue number	1
Publication status	Published - 1993

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@article{38980e46c5fb45bf90a47f11bcc68832,

title = "The 1st measurement of the Lyman continuum emission from normal stars",

abstract = "We report the first measurements of Lyman continuum emission from non-degenerate stars. The Wide Field Camera on-board ROSAT detected strong emission from Beta CMa (B1 II-III) and Epsilon CMa (B2 II). Both Kurucz LTE line-blanketed and Mihalas NLTE unblanketed model atmospheres can match the observed count rate for Beta CMa within the known constraints on T(eff) and N(H). For Epsilon CMa, we find that the interstellar column must be at most 9 x 10 exp 17/sq cm, and probably much lower still, to explain the very strong EUV flux. We also find marginal evidence for regular variability in the Lyman continuum emission for Beta CMa, but not at the dominant period of the known optical pulsations.",

author = "M.G. Hoare and J.E. Drew and M. Denby",

note = "Original article can be found at: http://adsabs.harvard.edu/basic_search.html Copyright Royal Astronomical Society [Full text of this article is not available in the UHRA]",

year = "1993",

language = "English",

volume = "262",

pages = "L19--L22",

journal = "Monthly Notices of the Royal Astronomical Society",

issn = "0035-8711",

publisher = "Oxford University Press (OUP)",

number = "1",

}

TY - JOUR

T1 - The 1st measurement of the Lyman continuum emission from normal stars

AU - Hoare, M.G.

AU - Drew, J.E.

AU - Denby, M.

N1 - Original article can be found at: http://adsabs.harvard.edu/basic_search.html Copyright Royal Astronomical Society [Full text of this article is not available in the UHRA]

PY - 1993

Y1 - 1993

N2 - We report the first measurements of Lyman continuum emission from non-degenerate stars. The Wide Field Camera on-board ROSAT detected strong emission from Beta CMa (B1 II-III) and Epsilon CMa (B2 II). Both Kurucz LTE line-blanketed and Mihalas NLTE unblanketed model atmospheres can match the observed count rate for Beta CMa within the known constraints on T(eff) and N(H). For Epsilon CMa, we find that the interstellar column must be at most 9 x 10 exp 17/sq cm, and probably much lower still, to explain the very strong EUV flux. We also find marginal evidence for regular variability in the Lyman continuum emission for Beta CMa, but not at the dominant period of the known optical pulsations.

AB - We report the first measurements of Lyman continuum emission from non-degenerate stars. The Wide Field Camera on-board ROSAT detected strong emission from Beta CMa (B1 II-III) and Epsilon CMa (B2 II). Both Kurucz LTE line-blanketed and Mihalas NLTE unblanketed model atmospheres can match the observed count rate for Beta CMa within the known constraints on T(eff) and N(H). For Epsilon CMa, we find that the interstellar column must be at most 9 x 10 exp 17/sq cm, and probably much lower still, to explain the very strong EUV flux. We also find marginal evidence for regular variability in the Lyman continuum emission for Beta CMa, but not at the dominant period of the known optical pulsations.

M3 - Article

SN - 0035-8711

VL - 262

SP - L19-L22

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 1

ER -

The 1st measurement of the Lyman continuum emission from normal stars

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