Stars: Their Life and Afterlife
... the visual magnitude scale) and its temperature or color (X-axis, using the spectral class scale). The first feature to notice in the HR diagram is how the stars form a stripe that goes from the lower-right towards the upper-left: this is known as the “main sequence.” It is NOT a sequence in the sen ...
... the visual magnitude scale) and its temperature or color (X-axis, using the spectral class scale). The first feature to notice in the HR diagram is how the stars form a stripe that goes from the lower-right towards the upper-left: this is known as the “main sequence.” It is NOT a sequence in the sen ...
http://webcache.googleusercontent.com/search?q=cache
... aspect, the native is reduced to being a door-keeper, admitting and saluting guests. [2] Ptolemy attributes a mercurial-saturnine nature to the constellation as a whole, but notes the principal star Arcturus (from Arktouros 'Bear Guard': arktos, bear + ouros, guard - from its position behind Ursa Ma ...
... aspect, the native is reduced to being a door-keeper, admitting and saluting guests. [2] Ptolemy attributes a mercurial-saturnine nature to the constellation as a whole, but notes the principal star Arcturus (from Arktouros 'Bear Guard': arktos, bear + ouros, guard - from its position behind Ursa Ma ...
thefixedstarsinnatal.. - Saptarishis Astrology
... The fixed stars operate by position and are said to "cast no rays," or in other words their aspects are said to be ineffective and their influence to be exerted only by conjunction and parallel. As in the case of the planets they are most powerful when in angles and weak when cadent, their effect b ...
... The fixed stars operate by position and are said to "cast no rays," or in other words their aspects are said to be ineffective and their influence to be exerted only by conjunction and parallel. As in the case of the planets they are most powerful when in angles and weak when cadent, their effect b ...
Galaxies - Indiana University Astronomy
... measured. The optical spectrum of the galaxy is shown at the top of the spectrum page. Shown are many different spectral features, including absorption lines and emission lines, superimposed on continuum emission from the galaxy, over the entire visible-light spectrum. Below the full optical spectru ...
... measured. The optical spectrum of the galaxy is shown at the top of the spectrum page. Shown are many different spectral features, including absorption lines and emission lines, superimposed on continuum emission from the galaxy, over the entire visible-light spectrum. Below the full optical spectru ...
9 Measuring the properties of stars - Journigan-wiki
... It offers a simple, pictorial summary of stellar properties. Most stars lie on the main sequence with the hotter stars being more luminous. Blue stars are hottest while red stars are the coolest A star’s mass determines its location along the main sequence with more massive stars located at the top. ...
... It offers a simple, pictorial summary of stellar properties. Most stars lie on the main sequence with the hotter stars being more luminous. Blue stars are hottest while red stars are the coolest A star’s mass determines its location along the main sequence with more massive stars located at the top. ...
Basics – II. Time, Magnitudes and Spectral types
... As we have seen, the tropical year marks the recurrence of the seasons, but is close to 365.25 days long. The civil year can contain either 365 (ordinary year) or 366 days (leap year) and by mixing these in approximately the ratio 3:1, the average year has a length close to that of the tropical year ...
... As we have seen, the tropical year marks the recurrence of the seasons, but is close to 365.25 days long. The civil year can contain either 365 (ordinary year) or 366 days (leap year) and by mixing these in approximately the ratio 3:1, the average year has a length close to that of the tropical year ...
stellar_explosions - UT Austin (Astronomy)
... km/sec gives age, which comes out to be about 950 years as it should. See Discovery 21-2 on p. 566. From the observed number of SNe (supernovae) in our own and other galaxies, we expect about 1 SN per 100 years in our Galaxy. But the last one was seen 400 years ago (Tycho’s SN). So we are overdue! H ...
... km/sec gives age, which comes out to be about 950 years as it should. See Discovery 21-2 on p. 566. From the observed number of SNe (supernovae) in our own and other galaxies, we expect about 1 SN per 100 years in our Galaxy. But the last one was seen 400 years ago (Tycho’s SN). So we are overdue! H ...
Mirrored Image Sep06.pub - High Desert Astronomical Society
... This dim, magnitude 9.57, star is the next closest to our Sun after the Alpha Centauri system. It is located about 5.96 light-years away in the northernmost part of the constellation Ophiuchus, the Serpent Holder; just west of Cebalrai (Beta Ophiuchi) near coordinates (17:57:48.5 +04:41:36.2, ICRS 2 ...
... This dim, magnitude 9.57, star is the next closest to our Sun after the Alpha Centauri system. It is located about 5.96 light-years away in the northernmost part of the constellation Ophiuchus, the Serpent Holder; just west of Cebalrai (Beta Ophiuchi) near coordinates (17:57:48.5 +04:41:36.2, ICRS 2 ...
Full Press Release - The Open University
... coming from both the massive star at the centre of the nebula and the newly born stars in the dense gas itself, and emits infrared light. The formation of a new generation of stars is now taking place within this compressed gas in these outer shell structures. The AKARI data reveals for the first ti ...
... coming from both the massive star at the centre of the nebula and the newly born stars in the dense gas itself, and emits infrared light. The formation of a new generation of stars is now taking place within this compressed gas in these outer shell structures. The AKARI data reveals for the first ti ...
K - College of San Mateo
... Meade 8” SCT telescope with f/6.3 focal reducer. The faster f/ratio allows shorter exposure times, and imaging of fainter stars. FL=1270mm. Focusing is done manually. SBIG SGS spectrograph with 600 lines per mm, with hi res. grating. Dispersion=1.06A/pixel. Stars are imaged in blue and/or red end of ...
... Meade 8” SCT telescope with f/6.3 focal reducer. The faster f/ratio allows shorter exposure times, and imaging of fainter stars. FL=1270mm. Focusing is done manually. SBIG SGS spectrograph with 600 lines per mm, with hi res. grating. Dispersion=1.06A/pixel. Stars are imaged in blue and/or red end of ...
1705 Star Charts
... The Evening Sky in May 2017 Two bright planets and the brightest stars share the evening sky this May. Soon after sunset golden Jupiter appears in the northeast. Beside Jupiter is Spica, the brightest star in Virgo. Below Jupiter, near the horizon, is orange Arcturus, the brightest star in the nort ...
... The Evening Sky in May 2017 Two bright planets and the brightest stars share the evening sky this May. Soon after sunset golden Jupiter appears in the northeast. Beside Jupiter is Spica, the brightest star in Virgo. Below Jupiter, near the horizon, is orange Arcturus, the brightest star in the nort ...
High Mass Stars
... The end result of the CNO cycle is the same as for the proton-proton chain - 4 protons produce 1 helium atom and release energy - but the steps are different. Carbon, nitrogen and oxygen act as catalysts that speed up the reaction. They aid the reaction without being consumed. Discovering Astronomy ...
... The end result of the CNO cycle is the same as for the proton-proton chain - 4 protons produce 1 helium atom and release energy - but the steps are different. Carbon, nitrogen and oxygen act as catalysts that speed up the reaction. They aid the reaction without being consumed. Discovering Astronomy ...
apparent magnitude - Harding University
... addition to the apparent back-and-forth motion due to the Earth’s orbit about the Sun). This motion is called proper motion, m, and is measured in arcseconds/year. Barnard’s Star exhibits the largest proper motion of any star – 10.25 arcseconds/year. ...
... addition to the apparent back-and-forth motion due to the Earth’s orbit about the Sun). This motion is called proper motion, m, and is measured in arcseconds/year. Barnard’s Star exhibits the largest proper motion of any star – 10.25 arcseconds/year. ...
Cassiopeia (constellation)
Cassiopeia is a constellation in the northern sky, named after the vain queen Cassiopeia in Greek mythology, who boasted about her unrivalled beauty. Cassiopeia was one of the 48 constellations listed by the 2nd-century Greek astronomer Ptolemy, and it remains one of the 88 modern constellations today. It is easily recognizable due to its distinctive 'M' shape when in upper culmination but in higher northern locations when near lower culminations in spring and summer it has a 'W' shape, formed by five bright stars. It is bordered by Andromeda to the south, Perseus to the southeast, and Cepheus to the north. It is opposite the Big Dipper.In northern locations above 34ºN latitude it is visible year-round and in the (sub)tropics it can be seen at its clearest from September to early November in its characteristic 'M' shape. Even in low southern latitudes below 25ºS is can be seen low in the North.