Antares Palette - RASC Kingston Centre
... The Faroe Islands’ large permanent population (~50,000 people), excellent infrastructure, and relative ease of access will likely tempt thousands of people from around the world to choose these islands as their preferred viewing location in March 2015. We travelled to the Faroe Islands in March 2014 ...
... The Faroe Islands’ large permanent population (~50,000 people), excellent infrastructure, and relative ease of access will likely tempt thousands of people from around the world to choose these islands as their preferred viewing location in March 2015. We travelled to the Faroe Islands in March 2014 ...
Hot subdwarf stars-galactic orbits and distribution perpendicular to
... Milky Way using these stars. A relation between these two goals can be found in the connection between the age of subdwarf stars and their spatial distribution. Old stars will more likely be distributed in a thicker disk, due to the heating up of their average kinematics through interactions with ot ...
... Milky Way using these stars. A relation between these two goals can be found in the connection between the age of subdwarf stars and their spatial distribution. Old stars will more likely be distributed in a thicker disk, due to the heating up of their average kinematics through interactions with ot ...
Pulsed Accretion in the Young Binary &
... Type I variations are periodic in VRI bands and are caused by rotational modulation of the star with an asymmetric distribution of cold spots (due to strong magnetic fields) on the stellar surface. These are thought to be analogous to sunspots, although they can cover up to 40% of the stellar surfac ...
... Type I variations are periodic in VRI bands and are caused by rotational modulation of the star with an asymmetric distribution of cold spots (due to strong magnetic fields) on the stellar surface. These are thought to be analogous to sunspots, although they can cover up to 40% of the stellar surfac ...
SGR 1900+14
... The two previous giant flares could have been detected Up to 8 Mpc; the recent one up to 40 Mpc Taking into account the SFR in our Galaxy, we would expect 80 such events per year to be compared with the 150 BATSE detected The isotropic distribution of short GRBs, the lack of excess from Virgo cluste ...
... The two previous giant flares could have been detected Up to 8 Mpc; the recent one up to 40 Mpc Taking into account the SFR in our Galaxy, we would expect 80 such events per year to be compared with the 150 BATSE detected The isotropic distribution of short GRBs, the lack of excess from Virgo cluste ...
Asteroid Rotation Periods
... issue and chance played an important role –however we can expect asteroid 2 Pallas to be larger than 219 Alice and that larger than 4.179 Toutatis). Although the best way to study an asteroid is by in situ measurements –ie by a spacecraft, this is very expensive and therefore only a small number of ...
... issue and chance played an important role –however we can expect asteroid 2 Pallas to be larger than 219 Alice and that larger than 4.179 Toutatis). Although the best way to study an asteroid is by in situ measurements –ie by a spacecraft, this is very expensive and therefore only a small number of ...
Super-Eddington outburst in a binary system: V4641 Sgr Mikhail Revnivtsev, Marat Gilfanov
... • We argue that V4641 Sgr in Sep. 1999 demonstrated an episode of super-Eddington accretion • During this episode a powerful expended evelope was formed • When the accretion rate decreased the envelope vanished • X-ray observations support this picture: we have detected the change in the X-ray absor ...
... • We argue that V4641 Sgr in Sep. 1999 demonstrated an episode of super-Eddington accretion • During this episode a powerful expended evelope was formed • When the accretion rate decreased the envelope vanished • X-ray observations support this picture: we have detected the change in the X-ray absor ...
Sparse aperture masking at the VLT II. Detection limits for the eight
... a debris disk, a proto-planetary disk or a planetary system. The understanding of such formation process requires the study of debris disks. These targets are substantial and particularly suitable for optical and infrared observations. Sparse Aperture masking (SAM) is a high angular resolution techn ...
... a debris disk, a proto-planetary disk or a planetary system. The understanding of such formation process requires the study of debris disks. These targets are substantial and particularly suitable for optical and infrared observations. Sparse Aperture masking (SAM) is a high angular resolution techn ...
Rocky planetesimals as the origin of metals in DZ stars
... obvious pattern is seen, although there may be a higher density of DZA stars near the Galactic disc and perhaps also towards more modest speeds, but the former may be an observational bias due to diminished spectroscopic sensitivity. In any case, one should expect a correlation between these quantit ...
... obvious pattern is seen, although there may be a higher density of DZA stars near the Galactic disc and perhaps also towards more modest speeds, but the former may be an observational bias due to diminished spectroscopic sensitivity. In any case, one should expect a correlation between these quantit ...
Conference Abstract Booklet here.
... light curves of Cepheid variables using the Fourier decomposition and principal component analysis methods. The theoretical Cepheid light curves are obtained using the full amplitude, nonlinear, convective hydrodynamical models for chemical compositions relative to Cepheids in the Galaxy (Y=0.28, Z= ...
... light curves of Cepheid variables using the Fourier decomposition and principal component analysis methods. The theoretical Cepheid light curves are obtained using the full amplitude, nonlinear, convective hydrodynamical models for chemical compositions relative to Cepheids in the Galaxy (Y=0.28, Z= ...
PP Chapter 28 Text
... Life cycle of stars: • Begins as a nebula • Advances to a protostar • Becomes a star when fusion in its core occurs Depending on its mass, the star may become a red giant and then burn out to become a white dwarf. ...
... Life cycle of stars: • Begins as a nebula • Advances to a protostar • Becomes a star when fusion in its core occurs Depending on its mass, the star may become a red giant and then burn out to become a white dwarf. ...
January 2014 Astronomy Calendar by Dave Mitsky Some
... Mercury returns to the evening sky by mid-month, beginning one of its two best evening apparitions of the year for mid-northern latitude observers. An extremely thin waning crescent Moon is located five degrees north of the planet on January 31. The tiny planet reaches a greatest eastern elongation ...
... Mercury returns to the evening sky by mid-month, beginning one of its two best evening apparitions of the year for mid-northern latitude observers. An extremely thin waning crescent Moon is located five degrees north of the planet on January 31. The tiny planet reaches a greatest eastern elongation ...
Jul y 10-12,
... obtained periods, or upper limits, for 12 XRTs in M31, using a relation between the optical and X-ray luminosities. We have been monitoring the M31 center with Chandra, following up XRTs with HST; 4σ B magnitude limits for counterparts are ∼ 26 − 29. We obtain period estimates for each XRT for both ...
... obtained periods, or upper limits, for 12 XRTs in M31, using a relation between the optical and X-ray luminosities. We have been monitoring the M31 center with Chandra, following up XRTs with HST; 4σ B magnitude limits for counterparts are ∼ 26 − 29. We obtain period estimates for each XRT for both ...
The cosmological significance of high
... We have used new and archival infrared and radio observations to search for a dwarf galaxy associated with the high-velocity cloud (HVC) known as Complex H. Complex H is a large (Ω & 400 deg2 ) and probably nearby (d = 27 kpc) HVC whose location in the Galactic plane has hampered previous investigat ...
... We have used new and archival infrared and radio observations to search for a dwarf galaxy associated with the high-velocity cloud (HVC) known as Complex H. Complex H is a large (Ω & 400 deg2 ) and probably nearby (d = 27 kpc) HVC whose location in the Galactic plane has hampered previous investigat ...
Open clusters and associations in the Gaia era
... an issue if the survey does not extend beyond the cluster tidal radius, especially if there is mass segregation as the incompleteness level will then depend on mass. Moreover, objects might be missed around bright stars due to contrast issue, in crowded regions or in area with high extinction. As fo ...
... an issue if the survey does not extend beyond the cluster tidal radius, especially if there is mass segregation as the incompleteness level will then depend on mass. Moreover, objects might be missed around bright stars due to contrast issue, in crowded regions or in area with high extinction. As fo ...
A Comet-Hunter`s Legacy -
... near-collision about six hundred million years in the past; and each time they pass by each other, they undergo episodes of star formation caused by their gravitational interaction. M81's bright spiral arms are the site of star formation, partially caused by density waves raised by the most recent p ...
... near-collision about six hundred million years in the past; and each time they pass by each other, they undergo episodes of star formation caused by their gravitational interaction. M81's bright spiral arms are the site of star formation, partially caused by density waves raised by the most recent p ...
Brightest Stars : Discovering the Universe Through the Sky`s Most
... under skies significantly degraded by human-made light pollution. In such a world, it is the brightest stars that everybody can see, even people who have only their unaided eyes to use. Are all the major kinds of stars represented by the twenty-one brightest, the stars of the so-called 1st magnitude ...
... under skies significantly degraded by human-made light pollution. In such a world, it is the brightest stars that everybody can see, even people who have only their unaided eyes to use. Are all the major kinds of stars represented by the twenty-one brightest, the stars of the so-called 1st magnitude ...
Period analysis of variable stars by robust smoothing
... minimizes the GCV score. However, with the recognition that a smoothing spline and thus the related GCV score are affected by outliers, we suggest a robust modification. In the robust cross-validation (RCV) method, we estimate the period to minimize the RCV score induced by a robust smoothing spline ...
... minimizes the GCV score. However, with the recognition that a smoothing spline and thus the related GCV score are affected by outliers, we suggest a robust modification. In the robust cross-validation (RCV) method, we estimate the period to minimize the RCV score induced by a robust smoothing spline ...
Cygnus (constellation)
Cygnus /ˈsɪɡnəs/ is a northern constellation lying on the plane of the Milky Way, deriving its name from the Latinized Greek word for swan. The swan is one of the most recognizable constellations of the northern summer and autumn, it features a prominent asterism known as the Northern Cross (in contrast to the Southern Cross). Cygnus was among the 48 constellations listed by the 2nd century astronomer Ptolemy, and it remains one of the 88 modern constellations.Cygnus contains Deneb, one of the brightest stars in the night sky and one corner of the Summer Triangle, as well as some notable X-ray sources and the giant stellar association of Cygnus OB2. One of the stars of this association, NML Cygni, is one of the largest stars currently known. The constellation is also home to Cygnus X-1, a distant X-ray binary containing a supergiant and unseen massive companion that was the first object widely held to be a black hole. Many star systems in Cygnus have known planets as a result of the Kepler Mission observing one patch of the sky, the patch is the area around Cygnus. In addition, most of the eastern part of Cygnus is dominated by the Hercules–Corona Borealis Great Wall, a giant galaxy filament that is the largest known structure in the observable universe; covering most of the northern sky.