An Atlas of Spectrophotometric Landolt Standard Stars

ABSTRACT We present CCD observations of 102 Landolt standard stars obtained with the Ritchey‐Chretien spectrograph on the Cerro Tololo Inter‐American Observatory 1.5 m telescope. Using stellar atmosphere models, we have extended the flux points to our six spectrophotometric secondary standards, in both the blue and the red, allowing us to produce flux‐calibrated spectra that span a wavelength range from 3050 A to 1.1 μm. Mean differences between UBVRI spectrophotometry computed using Bessell’s standard passbands and Landolt’s published photometry were determined to be 1% or less. Observers in both hemispheres will find these spectra useful for flux‐calibrating spectra, and through the use of accurately constructed instrumental passbands, will be able to compute accurate corrections to bring instrumental magnitudes to any desired standard photometric system (S‐corrections). In addition, by combining empirical and modeled spectra of the Sun, Sirius, and Vega, we calculate and compare synthetic photometry to...

[1]  B. J. Taylor.  An augmented system of secondary standards for bright-star spectrophotometry. , 1984 .

[2]  Nicholas B. Suntzeff,et al.  SOUTHERN SPECTROPHOTOMETRIC STANDARDS. I. , 1992 .

[3]  G. C. Strobel.  Stars resembling the Sun , 1996 .

[4]  Arlo U. Landolt,et al.  UBVRI Photometric Standard Stars in the Magnitude Range 11 , 1992 .

[5]  Kevin Krisciunas,et al.  Optical and Infrared Photometry of the Nearby Type Ia Supernova 2001el , 2002 .

[6]  The Distance to SN 1999em from the Expanding Photosphere Method , 2001, astro-ph/0105006.

[7]  G. Kron,et al.  Six-Color Photometry of Stars. X. The Stellar Magnitude and Color Index of the Sun. , 1957 .

[8]  Optical Light Curve of the Type Ia Supernova 1998bu in M96 and the Supernova Calibration of the Hubble Constant , 1998, astro-ph/9811205.

[9]  D. Hayes,et al.  Calibration of Fundamental Stellar Quantities , 1985 .

[10]  The effect of pass-bands on broad-band optical photometry of SN1987A , 1989 .

[11]  Arlo U. Landolt,et al.  Broadband UBVRI photometry of the baldwin-Stone southern hemisphere spectrophotometric standards , 1992 .

[12]  M. Bessell.  Spectrophotometry: Revised Standards and Techniques , 1999 .

[13]  S. E. Persson,et al.  Optical and Infrared Photometry of the Nearby Type Ia Supernovae 1999ee, 2000bh, 2000ca, and 2001ba , 2003, astro-ph/0311439.

[14]  Michael S. Bessell,et al.  VRI PHOTOMETRY : AN ADDENDUM. , 1983 .

[15]  G. Neugebauer,et al.  Infrared standard stars , 1982 .

[16]  S. E. Persson,et al.  A New System of Faint Near-Infrared Standard Stars , 1998 .

[17]  Arlo U. Landolt,et al.  UBVRI Photometric standard stars around the celestial equator. , 1983 .

[18]  Photometric observations of the Type Ia SN 2002er in UGC 10743 , 2004, astro-ph/0408234.

[19]  D. Hayes.  ABSOLUTE SPECTROPHOTOMETRIC CALIBRATION OF THE ENERGY DISTRIBUTION OF TWELVE STANDARD STARS. , 1970 .

[20]  N. Suntzeff,et al.  SN 1987A IN THE LARGE MAGELLANIC CLOUD. IV. PHOTOMETRY FROM THE SPECTROPHOTOMETRY , 1990 .

[21]  M. Thomas,et al.  Optical and Infrared Photometry of the Unusual Type Ia Supernova 2000cx , 2002, astro-ph/0212543.

[22]  L. Wallace,et al.  An atlas of the solar spectrum in the infrared from 1850 to 9000 cm-1 (1.1 to 5.4 μm), revised , 2003 .

[23]  Ingemar Furenlid,et al.  Solar flux atlas from 296 to 1300 nm , 1985 .

[24]  N. Suntzeff,et al.  SN 1987A in the LMC. II. Optical Photometry at Cerro Tololo , 1988 .

[25]  Mark R. Kidger,et al.  Spectral Irradiance Calibration in the Infrared. X. A Self-Consistent Radiometric All-Sky Network of Absolutely Calibrated Stellar Spectra , 1999 .

[26]  L. Colina,et al.  The 0.12-2.5 micron Absolute Flux Distribution of the Sun for Comparison With Solar Analog Stars , 1996 .

[27]  C. Stubbs,et al.  Optical Photometry of the Type I[CLC]a[/CLC] Supernova 1999[CLC]ee[/CLC] and the Type I[CLC]b[/CLC]/[CLC]c[/CLC] Supernova 1999[CLC]ex[/CLC] in IC 5179 , 2002 .