A “Short” Distance to the Large Magellanic Cloud With the Hipparcos Calibrated Red Clump Stars

نویسنده

  • K. Z. Stanek
چکیده

Following an approach developed by Paczyński & Stanek, we derive a distance to the Large Magellanic Cloud (LMC) by comparing red clump stars from the Hipparcos catalog with the red clump stars observed in two fields in the LMC that were selected from the ongoing photometric survey of the Magellanic Clouds to lie in low extinction regions. The use of red clump stars allows a single step determination of the distance modulus to the LMC, μ0,LMC = 18.065± 0.031± 0.09 mag (statistical plus systematic error), and the corresponding distance, RLMC = 41.02 ± 0.59 ± 1.74 kpc. This measurement is in excellent agreement with the recent determination by Udalski et al., also based on the red clump stars, but is ∼ 0.4 mag smaller than the generally accepted value of μ0,LMC = 18.50± 0.15 mag. We discuss possible reasons for this discrepancy and how it can be resolved. Subject headings: galaxies: distances and redshifts — galaxies: individual (LMC) — Solar neighborhood — stars: horizontal-branch On leave from Copernicus Astronomical Center, Warsaw, Poland

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

K-Band Red Clump Distance to the Large Magellanic Cloud

The Hipparcos I-band calibration of horizontal-branch red clump giants as standard candles has lead to controversial results for the distance to the Large Magellanic Cloud (LMC). In an attempt to properly ascertain the corrections for interstellar extinction and clump age and metallicity, we analyze new multiwavelength luminosity functions of the LMC red clump. Our photometry dataset in the K-b...

متن کامل

The Tip of the Red Giant Branch Distance to the Large Magellanic Cloud

We present the I–band luminosity function of the red giant branch stars in the Large Magellanic Cloud (LMC) using the data from the Magellanic Clouds Photometric Survey (Zaritsky, Harris & Thompson, 1997). Selecting stars in uncrowded, low– extinction regions, a discontinuity in the luminosity function is observed at I0 = 14.54 mag. Identifying this feature with the tip of the red giant branch ...

متن کامل

The Distance to the Lmc Cluster Ngc 1866 and the Surrounding Field

We use the Main Sequence stars in the LMC cluster NGC 1866 and of Red Clump stars in the local field to obtain two independent estimates of the LMC distance. We apply an empirical Main Sequence-fitting technique based on a large sample of subdwarfs with accurate Hipparcos parallaxes in order to estimate the cluster distance modulus, and the multicolor Red Clump method to derive distance and red...

متن کامل

Harmonizing the RR Lyrae and Clump Distance Scales — Stretching the Short Distance Scale to Intermediate Ranges?

I explore the consequences of making the RR Lyrae and clump giant distance scales consistent in the solar neighborhood, Galactic bulge and Large Magellanic Cloud (LMC). I employ two major assumptions: 1) that the absolute magnitude metallicity, MV (RR) – [Fe/H], relation for RR Lyrae stars is universal, and 2) that absolute I-magnitudes of clump giants, MI(RC), in Baade’s Window can be inferred...

متن کامل

Red Clump Morphology as Evidence Against a New Intervening Stellar Population as the Primary Source of Microlensing Toward the LMC

We examine the morphology of the color-magnitude diagram (CMD) for core helium-burning (red clump) stars to test the recent suggestion by Zaritsky & Lin (1997) that an extension of the red clump in the Large Magellanic Cloud (LMC) toward brighter magnitudes is due to an intervening population of stars that is responsible for a significant fraction of the observed microlensing toward the LMC. Us...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 1998