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Light curves and absolute magnitudes of four recent fast LMC novae

  • J.B. Hearnshaw (a1), C.M. Livingston (a1), A.C. Gilmore (a1) and P.M. Kilmartin (a1)

Abstract

The light curves of four recent fast LMC novae (Nova LMC 1988a, 1992, 1995, 2000) have been analysed to obtain the parameter t 2 the time for a two magnitude decline below maximum light. Using the calibration of Della Valle & Livio (1995), values of MV at maximum are obtained. The weighted mean distance modulus to the LMC based on these novae is 18.89 ± 0.16. This differs significantly from the distance modulus adopted by Della Valle & Livio of 18.50, but only differs at the 1σ-level from Feast’s (1999) value of 18.70 ± 0.10. The evidence based on these novae suggests that either: (i) DMLMC = 18.50 is too close for the LMC; or (ii) some novae in the LMC, including these four, are significantly underluminous at maximum light compared with those in M31, by about 0.4 mag. This could be a metallicity effect, given that more metal-rich M31 novae were predominantly used by Della Valle & Livio to obtain their calibration.

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References

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Della Valle, M., Livio, M. 1995, APJ, 452, 704
Feast, M.W. 1999, in New Views of the Magellanic Clouds, eds. Chu, Y.-H., Suntzeff, N., Hesser, J., & Bohlender, D., IAU Symp. 190, 542
Payne-Gaposchkin, C. 1957 The Galactic Novae, (North Holland Publishing Co., Amsterdam)

Light curves and absolute magnitudes of four recent fast LMC novae

  • J.B. Hearnshaw (a1), C.M. Livingston (a1), A.C. Gilmore (a1) and P.M. Kilmartin (a1)

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