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Bologna
April 25, 2017, 10:16 pm
Partly cloudy
Partly cloudy
18°C
real feel: 16°C
current pressure: 1010 mb
humidity: 48%
wind speed: 4 m/s S
sunrise: 6:14 am
sunset: 8:12 pm
 

SECCO 1: a very dark stellar system lost in Virgo

chart_sub

Left panel: Hα images of the two bodies of SECCO 1 (projected separation ~6 kpc ) extracted from the MUSE data cube. Right panels: HST -ACS images of the same region. At the distance of the object 10 arcsec correspond to 825 pc.

Many models of structure formation within the Lambda-CDM cosmological paradigm predict the

…→ Read More: SECCO 1: a very dark stellar system lost in Virgo

Gaia16aye: the first binary microlensing event ever discovered towards the Galactic Plane

Image of Gaia16aye obtained at the 1.5m G.D. Cassini Telescope, Loiano.

On 2016-08-05 the 1.2 mag brightening of an otherwise quiet stellar source triggered the Gaia16aye Gaia Science Alert, nicknamed Ayers Rock (19:40:01.13 +30:07:53.4, J2000). The previous 22 Gaia detections of the source (starting from 2014-10-30) show no variability greater than 0.05m RMS. The initial spectrophotometric observations did not clarify the nature of the

…→ Read More: Gaia16aye: the first binary microlensing event ever discovered towards the Galactic Plane

Gaia Data Release 1

The Gaia spacecraft was launched on December 19th, 2013 to perform a 5-year long all-sky scanning survey that will provide exquisitely accurate astrometry (100 times better than Hipparcos) and photometry for about one billion of Galactic stars down to G ~20.7 (Gaia unfiltered band), and radial velocity for several millions of stars to

…→ Read More: Gaia Data Release 1

OABO news from Gaia

hort period/faint magnitude Cepheids in the Large Magellanic Cloud observed by Gaia

A press release by G. Clementini (INAF-OABO), V. Ripepi (INAF-OACN), S. Leccia (INAF-OACN), et al. was published yesterday (May 28, 2015) on the ESA Gaia web page showing results from the DPAC-CU7 pipeline on the Gaia commissioning data.

The first paper of the Gaia Science Alerts programme: “Total eclipse of the heart: The AM CVn

…→ Read More: OABO news from Gaia

RR Lyrae stars in the Large Magellanic Cloud as seen by Gaia

RR-LMC-GAIA-vs-OGLE-dots-To

Left panels: G-band light curves of RR Lyrae stars in the Large Magellanic Cloud observed by Gaia during the EPSL scanning. Right panels: I-band light curves obtained for the same stars by the OGLE IV survey. All light curves cover a 1.5 pulsation cycle.

During the first part of the Gaia mission in Ecliptic

…→ Read More: RR Lyrae stars in the Large Magellanic Cloud as seen by Gaia