Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aj....115.1462m&link_type=abstract
The Astronomical Journal, Volume 115, Issue 4, pp. 1462-1471.
Astronomy and Astrophysics
Astronomy
29
Galaxies: Dwarf, Galaxies: Elliptical And Lenticular, Galaxies: Individual: Ngc 185, Galaxies: Stellar Content, Local Group
Scientific paper
We present VI CCD photometry of ~16,000 stars in a 7.2′ x 7.2′ field of the Local Group dwarf elliptical galaxy NGC 185. The resulting VI color-magnitude diagram reveals a dominant red giant branch population, an important number of luminous red stars located above the tip of the red giant branch, and a number of blue and yellow stars. Besides the nucleus, our field also covers a large, less crowded area of the galaxy. We show color-magnitude diagrams at six different distances from the nucleus. The red giant branch becomes substantially narrower at larger distances from the nucleus, while the photometry gets deeper. In this paper, we concentrate on investigating the contribution of the observational effects (mainly crowding) to this observed gradient. Although we cannot rule out here the possibility that this trend partially originates in a gradient of the characteristics of the stellar populations of the galaxy with radius, we show that a strong radial gradient exists in the observational effects that can mimic a gradient in the real properties (e.g., age, metallicity) of the stellar population. A distance modulus of m - M = 23.95 +/- 0.10 has been obtained from the tip of the red giant branch, in good agreement with previous estimates. The average stellar metallicity is estimated to be [Fe/H] = -1.43 +/- 0.15, and decreases for increasing galactocentric distance. Based on observations made with the William Herschel Telescope operated on the island of La Palma by the Isaac Newton Group in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias.
Aparicio Antonio
Martinez-Delgado David
No associations
LandOfFree
The Star Formation History of the Local Group Dwarf Elliptical Galaxy NGC 185. I. Stellar Content does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The Star Formation History of the Local Group Dwarf Elliptical Galaxy NGC 185. I. Stellar Content, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Star Formation History of the Local Group Dwarf Elliptical Galaxy NGC 185. I. Stellar Content will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1602346