The near-IR Surface Brightness Method applied to six Cepheids in the young LMC cluster NGC1866

Abstract

We present new near-IR light curves for six Cepheids in the young blue LMC cluster NGC1866 as well as high precision radial velocity curves for ten Cepheids in NGC1866 and two in NGC2031. For the six Cepheids in NGC1866 with new J and K light curves we determine distances and absolute magnitudes by applying the near-IR surface brightness method. We find that the formal error estimates on the derived distances are underestimated by about a factor of two. We find excellent agreement between the absolute magnitudes for the low metallicity LMC Cepheids with the Period-Luminosity (P-L) relation determined by the near-IR surface brightness (ISB) method for Galactic Cepheids suggesting that the slope of the P-L relations for low metallicity and solar metallicity samples could be very similar in contrast to other recent findings. Still there appears to be significant disagreement between the observed slopes of the OGLE based apparent P-L relations in the LMC and the slopes derived from ISB analysis of Galactic Cepheids, and by inference for Magellanic Cloud Cepheids, indicating a possible intrinsic problem with the ISB method itself. Resolving this problem could reaffirm the P-L relation as the prime distance indicator applicable as well to metallicities significantly different from the LMC value.

arXiv comment14 pages, 16 figures, accepted for publication in Astronomy and Astrophysics

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Cited by in corpus (15)

• On the mass-to-light ratio of the local Galactic disc and the optical luminosity of the Galaxy
• Calibrating the Cepheid Period-Luminosity relation from the infrared surface brightness technique II. The effect of metallicity, and the distance to the LMC
• Baade-Wesselink distances to Galactic and Magellanic Cloud Cepheids and the effect of metallicity
• Constraining globular cluster formation through studies of young massive clusters - III. A lack of gas and dust in massive stellar clusters in the LMC and SMC
• Baade-Wesselink distances and the effect of metallicity in classical cepheids
• Theoretical fit of Cepheid light an radial velocity curves in the Large Magellanic Cloud cluster NGC 1866
• Detailed chemical composition of classical Cepheids in the LMC cluster NGC 1866 and in the field of the SMC
• CORS Baade-Wesselink method in the Walraven photometric system: the Period-Radius and the Period-Luminosity relation of Classical Cepheids
• CORS Baade-Wesselink distance to the LMC NGC 1866 blue populous cluster
• The near-IR Surface Brightness Method applied to six Cepheids in the young LMC cluster NGC1866
• On the Enhancement of Mass Loss in Cepheids Due to Radial Pulsation. II. The Effect of Metallicity
• Infrared photometry of Cepheids in the LMC clusters NGC 1866 and NGC 2031
• The Cepheids of NGC1866: A Precise Benchmark for the Extragalactic Distance Scale and Stellar Evolution from Modern UBVI Photometry
• Binarity among Cepheids in the Magellanic Clouds
• Reconstruction of Cepheid Radial Velocity Curves from the shape of the V-band Light Curves