We study relationships between star-formation rate (SFR) and the accretion luminosity and nuclear obscuration of X-ray selected active galactic nuclei (AGNs) using a combination of deep far-infrared (FIR) and X-ray data in three key extragalactic survey fields (GOODS-South, GOODS-North and COSMOS), as part of the PACS Evolutionary Probe (PEP)

To understand the formation and evolution of solar-type stars and planets in the solar neighborhood, we need to obtain their stellar parameters with high precision. We present a catalog of precise stellar parameters for the FGK stars in a volume limited sample followed by the HARPS spectrograph in the quest for extra solar planets. The

We present the results of the analysis of spectra and photometry for more than 14,000 stars which are part of the second public data release of the Sloan Digital Sky Survey. We discuss the inferred metallicities and distances, which suggest that the formation of the Galactic thick disk took place over a short period of time.

Using effective temperature and metallicity derived from SDSS spectra for ~60,000 F- and G-type main-sequence stars (0.2

We introduce a new method to measure the dispersion of mmax values of star clusters and show that the observed sample of mmax is inconsistent with random sampling from a universal stellar initial mass function (IMF) at a 99.9 per cent confidence level. The scatter seen in the mmax-Mecl data can be mainly (76 per cent) understood as being the result

We report the discovery of a low-mass (0.26 +/- 0.02, 0.15 +/- 0.01Msolar) pre-main-sequence (PMS) eclipsing binary (EB) with a 5.3d orbital period. JW 380 was detected as part of a high-cadence time-resolved photometric survey (the Monitor project) using the 2.5-m Isaac Newton Telescope and Wide Field Camera for a survey of a single field in the