SIMBAD references

2012ApJ...756..108C - Astrophys. J., 756, 108 (2012/September-2)

Variability and star formation in Leo T, the lowest luminosity star-forming galaxy known today.

CLEMENTINI G., CIGNONI M., CONTRERAS RAMOS R., FEDERICI L., RIPEPI V., MARCONI M., TOSI M. and MUSELLA I.

Abstract (from CDS):

We present results from the first combined study of variable stars and star formation history (SFH) of the Milky Way "ultra-faint" dwarf (UFD) galaxy Leo T, based on F606W and F814W multi-epoch archive observations obtained with the Wide Field Planetary Camera 2 on board the Hubble Space Telescope. We have detected 14 variable stars in the galaxy. They include one fundamental-mode RR Lyrae star and 11 Anomalous Cepheids with periods shorter than 1 day, thus suggesting the occurrence of multiple star formation episodes in this UFD, of which one about 10 Gyr ago produced the RR Lyrae star. A new estimate of the distance to Leo T of 409+29_- 27_ kpc (distance modulus of 23.06 ±0.15 mag) was derived from the galaxy's RR Lyrae star. Our V, V - I color-magnitude diagram (CMD) of Leo T reaches V ∼ 29 mag and shows features typical of a galaxy in transition between dwarf irregular and dwarf spheroidal types. A quantitative analysis of the SFH, based on the comparison of the observed V, V - I CMD with the expected distribution of stars for different evolutionary scenarios, confirms that Leo T has a complex SFH dominated by two enhanced periods about 1.5 and 9 Gyr ago, respectively. The distribution of stars and gas shows that the galaxy has a fairly asymmetric structure.

Abstract Copyright:

Journal keyword(s): galaxies: dwarf - galaxies: individual: Leo T - galaxies: stellar content - stars: formation - stars: variables: Cepheids - stars: variables: RR Lyrae

VizieR on-line data: <Available at CDS (J/ApJ/756/108): table2.dat table3.dat>

Nomenclature: Table 2: [CCC2012] VNN (Nos V1-V14)

Simbad objects: 37

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2019.09.16-01:21:36

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