Near-infrared Spectral Characterization of Solar-type Stars in the Northern Hemisphere

Collin D. Lewin, Ellen S. Howell, Ronald J. Vervack, Yanga R. Fernández, Christopher Magri, Sean E. Marshall, Jenna L. Crowell, Mary L. Hinkle

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Although solar-analog stars have been studied extensively over the past few decades, most of these studies have focused on visible wavelengths, especially those identifying solar-analog stars to be used as calibration tools for observations. As a result, there is a dearth of well-characterized solar analogs for observations in the near-infrared, a wavelength range important for studying solar system objects. We present 184 stars selected based on solar-like spectral type and V-J and V-K colors whose spectra we have observed in the 0.8-4.2 μm range for calibrating our asteroid observations. Each star has been classified into one of three ranks based on spectral resemblance to vetted solar analogs. Of our set of 184 stars, we report 145 as reliable solar-analog stars, 21 as solar analogs usable after spectral corrections with low-order polynomial fitting, and 18 as unsuitable for use as calibration standards owing to spectral shape, variability, or features at low to medium resolution. We conclude that all but five of our candidates are reliable solar analogs in the longer wavelength range from 2.5 to 4.2 μm. The average colors of the stars classified as reliable or usable solar analogs are V-J = 1.148, V-H = 1.418, and V-K = 1.491, with the entire set being distributed fairly uniformly in R.A. across the sky between -27° and +67° in decl.

Original languageEnglish (US)
Article number130
JournalAstronomical Journal
Volume160
Issue number3
DOIs
StatePublished - Sep 2020
Externally publishedYes

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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