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2000 February 20

Volume 530, Number 2
The Astrophysical Journal Letters, 530:L111–L114, 2000 February 20
© 2000. The American Astronomical Society. All rights reserved. Printed in U.S.A.
DOI: 10.1086/312504

First Light Measurements of Capella with the Low-Energy Transmission Grating Spectrometer aboard the Chandra X-Ray Observatory

A. C. Brinkman,

C. J. T. Gunsing,

J. S. Kaastra,

R. L. J. van der Meer,

R. Mewe,

F. Paerels,1

A. J. J. Raassen,2 and

J. J. van Rooijen

Space Research Organization of the Netherlands (SRON), Sorbonnelaan 2, 3584 CA Utrecht, Netherlands

H. Bräuninger,

W. Burkert,

V. Burwitz,

G. Hartner, and

P. Predehl

Max-Planck-Institut für Extraterrestrische Physik, Postfach 1603, D-85740 Garching, Germany

J.-U. Ness and

J. H. M. M. Schmitt

Universität Hamburg, Gojenbergsweg 122, D-21029 Hamburg, Germany

and

J. J. Drake,

O. Johnson,

M. Juda,

V. Kashyap,

S. S. Murray,

D. Pease,

P. Ratzlaff, and

B. J. Wargelin

Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138

ABSTRACT

We present the first X-ray spectrum obtained by the Low-Energy Transmission Grating Spectrometer (LETGS) aboard the Chandra X-Ray Observatory. The spectrum is of Capella and covers a wavelength range of 5–175 Å (2.5–0.07 keV). The measured wavelength resolution, which is in good agreement with ground calibration, is Å (FWHM). Although in-flight calibration of the LETGS is in progress, the high spectral resolution and unique wavelength coverage of the LETGS are well demonstrated by the results from Capella, a coronal source rich in spectral emission lines. While the primary purpose of this Letter is to demonstrate the spectroscopic potential of the LETGS, we also briefly present some preliminary astrophysical results. We discuss plasma parameters derived from line ratios in narrow spectral bands, such as the electron density diagnostics of the He-like triplets of carbon, nitrogen, and oxygen, as well as resonance scattering of the strong Fe xvii line at 15.014 Å.

Received 1999 November 23; accepted 1999 December 23; published 2000 January 25

Subject headings:

instrumentation: spectrographs—line: identification—plasmas—stars: coronae—stars: individual (Capella)—X-rays: stars

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  • 1Present address: Columbia University, New York, NY.

  • 2Also at Astronomical Institute “Anton Pannekoek,” Kruislaan 403, 1098 SJ Amsterdam, Netherlands.

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