The UBV Color Evolution of Classical Novae. III. Time-stretched Color-Magnitude Diagram of Novae in Outburst

Izumi Hachisu, Mariko Kato

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

We propose a modified color-magnitude diagram for novae in outburst, i.e., (B - V) 0 versus (M V - 2.5 log f s ), where f s is the time-scaling factor of a (target) nova against a comparison (template) nova, (B - V) 0 is the intrinsic B - V color, and M V is the absolute V magnitude. We dub it the time-stretched color-magnitude diagram. We carefully reanalyzed 20 novae based on the time-stretching method and revised their extinctions E(B - V), distance moduli in the V-band (m - M) V , distances d, and time-scaling factors f s against the template nova LV Vul. We have found that these 20 nova outburst tracks broadly follow one of the two template tracks, the LV Vul/V1668 Cyg or V1500 Cyg/V1974 Cyg group, in the time-stretched color-magnitude diagram. In addition, we estimate the white dwarf masses and (m - M) V of the novae by directly fitting the absolute V model light curves (M V ) with observational apparent V magnitudes (m V ). A good agreement of the two estimates of (m - M) V confirms the consistency of the time-stretched color-magnitude diagram. Our distance estimates are in good agreement with the results of Gaia Data Release 2.

Original languageEnglish
Article number4
JournalAstrophysical Journal, Supplement Series
Volume241
Issue number1
DOIs
Publication statusPublished - 2019 Mar 1

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novae
color-magnitude diagram
outburst
diagram
color
templates
estimates
scaling
extremely high frequencies
light curve
extinction

Keywords

  • cataclysmic variables
  • novae
  • stars: individual (V574 Pup, V679 Car, V1369 Cen, V5666 Sgr)

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

The UBV Color Evolution of Classical Novae. III. Time-stretched Color-Magnitude Diagram of Novae in Outburst. / Hachisu, Izumi; Kato, Mariko.

In: Astrophysical Journal, Supplement Series, Vol. 241, No. 1, 4, 01.03.2019.

Research output: Contribution to journalArticle

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