An Atlas of Stellar Spectra
... The problem of a classification according to luminosity is a difficult one. In the first place, lines or
blends which may be useful at one spectral type may be quite insensitive at another. In fact, some lines
which show a positive absolute-magnitude effect for some spectral classes may show a negat ...
... is a 16 detector-array infrared camera that samples 1.65 deg2 .
Each 2048 × 2048 detector is sensitive over λ = 0.8–2.5 μm and
delivers images with an average pixel scale of 0.34 arcsec px−1 .
A single exposure corresponds to a patchy individual “pawprint”
coverage on the sky. To fill the gaps and t ...
constellations - Richmond and Glen Allen Weather
... What is a constellation? Constellation is derived from the Latin "constellatus," set with stars;
from "com-," together, and "stellare," to shine; stella, a star. A constellation is a group of stars, which
might form a pattern or shape within a specific area of the sky and is often named after people ...
365 days of SKYWATCHING
... study - the Moon. Its rugged craters, high mountains and vast seas offer some
of the ﬁnest details to be found in any astronomical target. It changes every
night as the terminator - the line between sunset and shadow - progresses over
the surface, revealing new details.
Unlike a star chart, Moon fea ...
Book Describing Techniques to Detect Transiting ExoPlanets
... of planets must exist! This is the message from the tally of ~ 400 extra-solar planetary systems (as of
mid-2009). Among them are 60 exoplanets that transit in front of their star (46 that are brighter than
14th magnitude), and the number is growing with a doubling time of 1.1 years.
It is important ...
... Stars are divided into spectral classes depending on their effective (surface) temperatures, which determine their intrinsic colors. The sequence
from hottest to coolest is O–B–A–F–G–K–M, followed by the even cooler
brown dwarfs. O-type stars are blue, with temperatures T & 20000 K, while
red M-type ...
Search For Gas Giants Around Late-m Dwarfs - STARS
... We carried out a near-infrared radial velocity search for Jupiter-mass planets around 36 late
M dwarfs. This survey was the first of its kind undertaken to monitor radial velocity variability of these faint dwarfs. For this unique survey we employed the 10-m Keck II on Mauna
Kea in Hawaii. With a re ...
... 24. H—“ Gravity causes part of a cloud of gas and dust to collapse and heat up”; gravitational force is the only one
mentioned in the passage.
25. B—“ hydrogen to make helium in a shell surrounding its center.” This answer comes straight from the passage, and
the question directs you to find the ans ...
Astronomy Astrophysics - Niels Bohr Institutet
... A major eﬀort has been devoted to the determination of new isochrone ages for all stars for which this is possible. Particular
attention has been given to a realistic treatment of statistical biases and error estimates, as standard techniques tend to underestimate these eﬀects and introduce spurious ...
... near the north pole (cf. Section A.2.2). (7) The ecliptic crosses the equator 5° west
of the colure lines. This arrangement is wrong by definition, as precession moves
the sky along the ecliptic, suggesting that the sculptor made the change because of
his lack of astronomical knowledge. (8) The stri ...
Selected observation targets at a glance per constellation
... rotational velocity of 245 km/s. White main sequence star, evolving into a
subgiant. A massive asteroid belt was confirmed in the star’s orbit in 2001.
This was the first extra-solar asteroid belt discovered.
17 Leporis, SS Leporis, a spectroscopic binary, components belong to the
spectral classes A ...
Corona Borealis /kɵˈroʊnə bɒriˈælɨs/ is a small constellation in the Northern Celestial Hemisphere. It is one of the 48 constellations listed by the 2nd-century astronomer Ptolemy, and remains one of the 88 modern constellations. Its brightest stars form a semicircular arc. Its Latin name, inspired by its shape, means ""northern crown"". In classical mythology Corona Borealis generally represented the crown given by the god Dionysus to the Cretan princess Ariadne and set by him in the heavens. Other cultures likened the pattern to a circle of elders, an eagle's nest, a bear's den, or even a smokehole. Ptolemy also listed a southern counterpart, Corona Australis, with a similar pattern. The brightest star is the magnitude 2.2 Alpha Coronae Borealis. The yellow supergiant R Coronae Borealis is the prototype of a rare class of giant stars—the R Coronae Borealis variables—that are extremely hydrogen deficient, and thought to result from the merger of two white dwarfs. T Coronae Borealis, also known as the Blaze Star, is another unusual type of variable star known as a recurrent nova. Normally of magnitude 10, it last flared up to magnitude 2 in 1946. ADS 9731 and Sigma Coronae Borealis are multiple star systems with six and five components respectively. Five star systems have been found to have Jupiter-sized exoplanets. Abell 2065 is a highly concentrated galaxy cluster one billion light-years from our Solar System containing more than 400 members, and is itself part of the larger Corona Borealis Supercluster.