2.1 Introduction
... the same distance from the Sun, and (ii) have the same age. NGC 265 (left panel of Figure 2.1) is approximately 300 million years old and is located in the Small Magellanic Cloud, one of our two companion galaxies at a distance of ∼ 60 kpc. Trumpler 14 (right panel of Figure 2.1) is one of the young ...
... the same distance from the Sun, and (ii) have the same age. NGC 265 (left panel of Figure 2.1) is approximately 300 million years old and is located in the Small Magellanic Cloud, one of our two companion galaxies at a distance of ∼ 60 kpc. Trumpler 14 (right panel of Figure 2.1) is one of the young ...
December
... Fully one-third of the 1st magnitude stars visible in the sky (seven of twenty-one) are in the Winter Circle with Sirius, Procyon, Pollux - toss in 2nd magnitude Castor - Capella, Aldebaran, and Rigel on the periphery, and Betelgeuse located off-center. Although somewhat flattened, and thus more ell ...
... Fully one-third of the 1st magnitude stars visible in the sky (seven of twenty-one) are in the Winter Circle with Sirius, Procyon, Pollux - toss in 2nd magnitude Castor - Capella, Aldebaran, and Rigel on the periphery, and Betelgeuse located off-center. Although somewhat flattened, and thus more ell ...
Astronomy Worksheet
... These are often caused by molecular absorption instead of absorption from a single element, and are known as molecular bands. In addition to gases around stars absorbing energy, Earth’s own atmosphere absorbs some of the frequencies from stars. These telluric absorption bands are well-established an ...
... These are often caused by molecular absorption instead of absorption from a single element, and are known as molecular bands. In addition to gases around stars absorbing energy, Earth’s own atmosphere absorbs some of the frequencies from stars. These telluric absorption bands are well-established an ...
Ch 28 Outline
... Most stars fall into distinct groups in the H-R Diagram because the groups represent stages in the life cycles of stars. The majority of stars – about 90% - are in a band that runs from the UPPER LEFT of the diagram (HIGH LUMINOSITY, HIGH SURFACE TEMPERATURE) to the LOWER RIGHT (LOW LUMINOSITY, LOW ...
... Most stars fall into distinct groups in the H-R Diagram because the groups represent stages in the life cycles of stars. The majority of stars – about 90% - are in a band that runs from the UPPER LEFT of the diagram (HIGH LUMINOSITY, HIGH SURFACE TEMPERATURE) to the LOWER RIGHT (LOW LUMINOSITY, LOW ...
Teacher Guide Lives of Stars
... 112.33(c)-11C: evaluate the relationship between mass and fusion on the dying process and properties of stars. 112.33(c)-11D: differentiate among the end states of stars, including white dwarfs, neutron stars, and black holes. 112.33(c)-11E: compare how the mass and gravity of a main sequence star w ...
... 112.33(c)-11C: evaluate the relationship between mass and fusion on the dying process and properties of stars. 112.33(c)-11D: differentiate among the end states of stars, including white dwarfs, neutron stars, and black holes. 112.33(c)-11E: compare how the mass and gravity of a main sequence star w ...
V Example: our SUN (G2V)
... A supernova occurs when the core of the massive star collapses and a shock wave rips the star apart, usually leaving behind a neutron star. Supernovae can also be produced when enough material is deposited on a white dwarf so that is exceeds the Chandrasekhar limit and collapses to a neutron star. B ...
... A supernova occurs when the core of the massive star collapses and a shock wave rips the star apart, usually leaving behind a neutron star. Supernovae can also be produced when enough material is deposited on a white dwarf so that is exceeds the Chandrasekhar limit and collapses to a neutron star. B ...
March
... Bright planets are low in the east and west at the beginning of the month. Venus (not shown on the chart) might be seen from places with a low western skyline, setting 40 minutes after the Sun at the start of the month. It sets steadily earlier, disappearing by mid-March. Golden Jupiter rises in the ...
... Bright planets are low in the east and west at the beginning of the month. Venus (not shown on the chart) might be seen from places with a low western skyline, setting 40 minutes after the Sun at the start of the month. It sets steadily earlier, disappearing by mid-March. Golden Jupiter rises in the ...
Stars
... in the sky Stars appear close together in the sky, however, they are actually light years from each other ...
... in the sky Stars appear close together in the sky, however, they are actually light years from each other ...
October 2012 - astronomy for beginners
... Very few constellations look like the characters after which they are named. Cygnus the Swan, Leo the Lion and Orion the Hunter are perhaps exceptions and do (with a little imagination) look remotely like those characters. The stars making up the constellations are not generally physically associate ...
... Very few constellations look like the characters after which they are named. Cygnus the Swan, Leo the Lion and Orion the Hunter are perhaps exceptions and do (with a little imagination) look remotely like those characters. The stars making up the constellations are not generally physically associate ...
Stars: Properties and Classification
... – the total amount of power being released from a star (this is an intrinsic property of the star). n Brightness – the power from that star that actually gets to us. This is the quantity we measure with a telescope. A Star s brightness depends on its distance from us. - there are stars much more lu ...
... – the total amount of power being released from a star (this is an intrinsic property of the star). n Brightness – the power from that star that actually gets to us. This is the quantity we measure with a telescope. A Star s brightness depends on its distance from us. - there are stars much more lu ...
Star luminosity info and HR diagram
... The ancient astronomers believed the stars were attached to a gigantic crystal sphere surrounding Earth. In that scenario, all stars were located at the same distance from Earth, and so, to the ancients, the brightness or dimness of stars depended only on the stars themselves. In our cosmology, the ...
... The ancient astronomers believed the stars were attached to a gigantic crystal sphere surrounding Earth. In that scenario, all stars were located at the same distance from Earth, and so, to the ancients, the brightness or dimness of stars depended only on the stars themselves. In our cosmology, the ...
29-4 - Fremont Peak Observatory
... 14° 48.4’. R Lep is a “Carbon Star,” and as such it is a long period variable star. It is often called “Hind’s Crimson Star” because of its colour. British astronomer J. R. Hind first observed the star in 1845. Hind reported that the star appeared “like a drop of blood on a black field.” R Lep varie ...
... 14° 48.4’. R Lep is a “Carbon Star,” and as such it is a long period variable star. It is often called “Hind’s Crimson Star” because of its colour. British astronomer J. R. Hind first observed the star in 1845. Hind reported that the star appeared “like a drop of blood on a black field.” R Lep varie ...
Lecture 31: The Properties of Stars
... The Hertzsprung-Russell (HR) Diagram plots luminosity vs. temperature, dividing stars into main-sequence and giants. ...
... The Hertzsprung-Russell (HR) Diagram plots luminosity vs. temperature, dividing stars into main-sequence and giants. ...
How Bright is that star?
... Relates luminosity, temperature and Radius of a star. The luminosity/meter² (l), is determined by the temperature (T) of that area ) l = σT⁴ (σ is a constant which if T is in °K, l comes out in Watts) Surface area is determined by radius(R): A = 4πR² So the total Lumnosity of star becomes L = 4πR²σT ...
... Relates luminosity, temperature and Radius of a star. The luminosity/meter² (l), is determined by the temperature (T) of that area ) l = σT⁴ (σ is a constant which if T is in °K, l comes out in Watts) Surface area is determined by radius(R): A = 4πR² So the total Lumnosity of star becomes L = 4πR²σT ...
Earth Science Notes
... in the sky Stars appear close together in the sky, however, they are actually light years from each other ...
... in the sky Stars appear close together in the sky, however, they are actually light years from each other ...
Teacher Guide - Astronomy Outreach at UT Austin
... The Cast Page the photon reporter: an energetic but sensitive photon journalist who is interviewing the Sun for her column in the Local Group Times. Sol the white dwarf: a kind and friendly star, our Sun at the end of his life. Sol used to be a yellow star. This interview takes place about 5 billion ...
... The Cast Page the photon reporter: an energetic but sensitive photon journalist who is interviewing the Sun for her column in the Local Group Times. Sol the white dwarf: a kind and friendly star, our Sun at the end of his life. Sol used to be a yellow star. This interview takes place about 5 billion ...
answers2006_07_BC
... masses, from its arrival on the main sequence to the end of fusion processes, including an account of the remnant left after fusion stops. Include a sketch of its trajectory on the HR diagram, and where possible relate your description to the features of the HIPPARCOS ...
... masses, from its arrival on the main sequence to the end of fusion processes, including an account of the remnant left after fusion stops. Include a sketch of its trajectory on the HR diagram, and where possible relate your description to the features of the HIPPARCOS ...
Double Stars Discovered by IOTA Predicted Occultations July, 2010
... continues to be an excellent method of finding or verifying double stars. Any time a light curve is obtained from a video record, it should be carefully examined for the presence of step events that could be due to duplicity of the target star. Integrating cameras can sometimes make light curve inte ...
... continues to be an excellent method of finding or verifying double stars. Any time a light curve is obtained from a video record, it should be carefully examined for the presence of step events that could be due to duplicity of the target star. Integrating cameras can sometimes make light curve inte ...
THE PROPERTIES OF MAIN-SEQUENCE STARS - Cosmos
... in the Michigan catalogues and (ii) had spectroscopic parallaxes that placed them within 80 pc of the Sun. Of these, 3727 are well determined as luminosity class V and actually lie within 100 pc. From this subsample we can determine the distribution in MV of mainsequence stars of given spectral type ...
... in the Michigan catalogues and (ii) had spectroscopic parallaxes that placed them within 80 pc of the Sun. Of these, 3727 are well determined as luminosity class V and actually lie within 100 pc. From this subsample we can determine the distribution in MV of mainsequence stars of given spectral type ...
The Night Sky This Month - Usk Astronomical Society
... of 5.92, is far too dim to observe under these conditions. It improves as the weeks pass, but is unfavourable this month. Neptune rises just before dawn in the constellation of Aquarius in the south-southeast, early in the month. However, at a magnitude of 7.90, is far too dim to see with the naked ...
... of 5.92, is far too dim to observe under these conditions. It improves as the weeks pass, but is unfavourable this month. Neptune rises just before dawn in the constellation of Aquarius in the south-southeast, early in the month. However, at a magnitude of 7.90, is far too dim to see with the naked ...
Ch. 17 (RGs & WDs)
... Uranometria – Bayer’s star atlas (1603) In the early 18th century, stars were numbered from west to east in a constellation (61 Cygni) [Flamsteed notation] John Flamsteed Atlas Coelestis (1725) ...
... Uranometria – Bayer’s star atlas (1603) In the early 18th century, stars were numbered from west to east in a constellation (61 Cygni) [Flamsteed notation] John Flamsteed Atlas Coelestis (1725) ...
Astronomical Distance Determination
... moving cluster, etc., that had longer baselines than an AU, but were not very accurate and, since Hipparchos, are not used anymore. E.g. the motion of the sun around the center of the Galaxy, 250 km/s, corresponds to 53 AU/yr. Most of the nearby stars are moving along with us, but not precisely. Bar ...
... moving cluster, etc., that had longer baselines than an AU, but were not very accurate and, since Hipparchos, are not used anymore. E.g. the motion of the sun around the center of the Galaxy, 250 km/s, corresponds to 53 AU/yr. Most of the nearby stars are moving along with us, but not precisely. Bar ...
Magnitudes and Colours of Stars - Lincoln
... Let’s leave brightness for now, and start thinking about stellar size: another important property for classifying stars. It is almost impossible to actually see a star through a telescope and measure its physical diameter. We can do this with objects within the Solar System, but the stars are simply ...
... Let’s leave brightness for now, and start thinking about stellar size: another important property for classifying stars. It is almost impossible to actually see a star through a telescope and measure its physical diameter. We can do this with objects within the Solar System, but the stars are simply ...
Canis Minor
Canis Minor /ˌkeɪnɨs ˈmaɪnər/ is a small constellation in the northern celestial hemisphere. In the second century, it was included as an asterism, or pattern, of two stars in Ptolemy's 48 constellations, and it is counted among the 88 modern constellations. Its name is Latin for ""lesser dog"", in contrast to Canis Major, the ""greater dog""; both figures are commonly represented as following the constellation of Orion the hunter.Canis Minor contains only two stars brighter than the fourth magnitude, Procyon (Alpha Canis Minoris), with a magnitude of 0.34, and Gomeisa (Beta Canis Minoris), with a magnitude of 2.9. The constellation's dimmer stars were noted by Johann Bayer, who named eight stars including Alpha and Beta, and John Flamsteed, who numbered fourteen. Procyon is the seventh-brightest star in the night sky, as well as one of the closest. A yellow-white main sequence star, it has a white dwarf companion. Gomeisa is a blue-white main sequence star. Luyten's Star is a ninth-magnitude red dwarf and the Solar System's next closest stellar neighbour in the constellation after Procyon. The fourth-magnitude HD 66141, which has evolved into an orange giant towards the end of its life cycle, was discovered to have a planet in 2012. There are two faint deep sky objects within the constellation's borders. The 11 Canis-Minorids are a meteor shower that can be seen in early December.