ABSTRACT We report the discovery of closest known black hole candidate as a binary companion to V723 Mon. Mon is nearby ($d\sim 460\, \rm pc$), bright (V ≃ 8.3 mag), evolved (Teff, giant 4440 K, and Lgiant 173 L⊙) red in high mass function, f(M) = 1.72 ± 0.01 M⊙, nearly circular (P 59.9 d, e 0). variable star, previously classified an eclipsing binary, but its All-Sky Automated Survey, Kilodegr...

Misalignments between a forming star's rotation axis and its outer disk axis, although not predicted by standard theories of stellar formation, have been observed in several classical T Tauri stars (cTTs). The low-mass cTTs DK Tau is suspected being among them. It also an excellent subject to investigate the interaction magnetic fields material accreting from circumstellar disk, as it presents ...

BACKGROUND Postoperative optic opacification of hydrophilic acrylic intraocular lenses (IOLs) is an uncommon complication leading to IOL explantation. In the past decade, several studies reported that the granular deposits responsible for the opacification were probably calcium and phosphate salts; however, the exact mechanism causing calcification of IOLs is unknown. The aim of this study is t...

In this study I present new K and L-band infrared photometry and 2-4μm spectra of ten Class I and flat spectrum stars forming within the Taurus dark cloud complex. Nine sources have H2 v=0-1 S(1) emission, and some show multiple H2 emission features in their K-band spectra. Photospheric absorptions characteristic to low mass stars are detected in five of the targets, and these stars were fit wi...

We present a spectroscopic study of candidate brown dwarf members of the Orion Nebula Cluster (ONC). We obtained new J– and/or K–band spectra of ∼100 objects within the ONC which are expected to be substellar based on their K, (H − K) magnitudes and colors. Spectral classification in the near-infrared of young low mass objects is described, including the effects of surface gravity, veiling due ...

Context. The Gaia-ESO Public Spectroscopic Survey is obtaining high quality spectroscopy of some 100,000 Milky Way stars using the FLAMES spectrograph at the VLT. Aims. This paper describes the analysis of UVES and GIRAFFE spectra acquired in the fields of young clusters whose population includes pre-main sequence (PMS) stars. Methods. Both methods that have been extensively used in the past an...

OBJECTIVE Few data exist looking at vitamin D status and bone health in school-aged boys and girls from Saudi Arabia. The present study aimed to determine the extent of poor vitamin D status in school boys and girls aged 6-18 years and to examine if there was any difference in status with age, physical activity and veiling and concomitant effects on bone. DESIGN Cross-sectional study. SETTI...

It is now understood that the genetic plasticity of cancer cells can lead to alterations that confer selective growth advantages to the tumor, some of which play a role in immune escape. A number of mutations veiling tumor cells from host immune defenses have been well characterized but more recent studies suggest that a variety of tumors can also express products that are actually toxic for th...

We report the results of a spectroscopic survey of 20 close T Tauri binaries in the Taurus-Auriga dark cloud where the separations between primaries and their secondaries are less than the typical size of a circumstellar disk around a young star. Analysis of low-resolution and medium-resolution STIS spectra yields the stellar luminosities, reddenings, ages, masses, mass accretion rates, IR exce...

Schwartz 82 (IM Lupi; HBC 605; IRAS 15528-3747) is an M0 T Tauri star located within the Lupus star forming clouds at a distance of ∼190 pc (Wichmann et al. 1998). It is one of four young stellar objects in a small CO(1-0) core near the extreme T Tauri star RU Lupi (Tachihara et al. 1996). Unlike its more famous neighbor, Sz 82 displays only a modest amount of emission-line activity, with an Hα...