January 2015 - Newbury Astronomical Society
... tidal radius has a radius of 33 light years. However, about one-third of confirmed member stars have been observed to be well outside this boundary in the cluster's extended halo. These stars are probably in the process of escaping from the cluster’s gravitational influence. The Seven Sisters are ab ...
... tidal radius has a radius of 33 light years. However, about one-third of confirmed member stars have been observed to be well outside this boundary in the cluster's extended halo. These stars are probably in the process of escaping from the cluster’s gravitational influence. The Seven Sisters are ab ...
Lecture 10: The Hertzsprung
... See also Figure 19-21 in your book There is a mass-luminosity relation on the main sequence. We can use that + a sample of stars where we get all the stars within a certain distance of the Sun to figure out how many stars of what masses are out there. Answer: Lots of low-mass stars! Very few high-m ...
... See also Figure 19-21 in your book There is a mass-luminosity relation on the main sequence. We can use that + a sample of stars where we get all the stars within a certain distance of the Sun to figure out how many stars of what masses are out there. Answer: Lots of low-mass stars! Very few high-m ...
A Study of the Spiral Galaxy M101 Elizabeth City State University
... A galaxy is the largest single unit of stars held together by gravity. There are three different types of galaxies, spiral, elliptical, and irregular. Figures 1a, b, and c show examples of each type. Galaxies have an enormous range in mass and size as indicated in Table 1. Galaxies are separated by ...
... A galaxy is the largest single unit of stars held together by gravity. There are three different types of galaxies, spiral, elliptical, and irregular. Figures 1a, b, and c show examples of each type. Galaxies have an enormous range in mass and size as indicated in Table 1. Galaxies are separated by ...
Lesson 4. Wiens and Stefans Laws
... 1. The peak intensity of thermal radiation from the Sun is at a wavelength of 500 nm, calculate the surface temperature of the Sun. 2. A star has a power output of 6.0 x 1028 W and a surface temperature of 3400K, calculate its radius and the ratio to the Sun’s radius (rsun = 7 x 108 m) ...
... 1. The peak intensity of thermal radiation from the Sun is at a wavelength of 500 nm, calculate the surface temperature of the Sun. 2. A star has a power output of 6.0 x 1028 W and a surface temperature of 3400K, calculate its radius and the ratio to the Sun’s radius (rsun = 7 x 108 m) ...
HR Diagram - TeacherWeb
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Luminosity
... These two stars have about the same luminosity— which one appears brighter? A. Alpha Centauri B. The Sun ...
... These two stars have about the same luminosity— which one appears brighter? A. Alpha Centauri B. The Sun ...
DSLR Photometry
... Des says in theory it is advisable to also construct master flat field frames in order to remove the effects of the edge distortions of lens. Des has found, however, that the field of view of a DSLR is so wide that a flat field is not required, if you are using high quality lenses, provided the targ ...
... Des says in theory it is advisable to also construct master flat field frames in order to remove the effects of the edge distortions of lens. Des has found, however, that the field of view of a DSLR is so wide that a flat field is not required, if you are using high quality lenses, provided the targ ...
Masses are much harder than distance, luminosity, or temperature
... • Range of different mass stars! ...
... • Range of different mass stars! ...
color-stellar mass diagram
... redshift, we see cosmic epochs of vigorous star formation portion of the Hubble Deep Field galaxies appear more irregular than present day galaxies we see them through the light emitted in UV by the young stars but in UV also nearby galaxies appear less regular ...
... redshift, we see cosmic epochs of vigorous star formation portion of the Hubble Deep Field galaxies appear more irregular than present day galaxies we see them through the light emitted in UV by the young stars but in UV also nearby galaxies appear less regular ...
Stars - CBSD.org
... Magnitudes • Hipparchus decided that all the brightest stars in the night sky were “first order magnitude” stars. • As they got dimmer, he classified them as “second magnitude,” “third magnitude,” and so on… • He got up to magnitude 6, after which stars are too dim to be seen without a telescope. • ...
... Magnitudes • Hipparchus decided that all the brightest stars in the night sky were “first order magnitude” stars. • As they got dimmer, he classified them as “second magnitude,” “third magnitude,” and so on… • He got up to magnitude 6, after which stars are too dim to be seen without a telescope. • ...
A New Variable Star in Perseus
... The secondary minima are shown in Figure 6 and Figure 7. Using this two minima, the duration of the flat part of the secondary minimum is determined as 583 minutes. ...
... The secondary minima are shown in Figure 6 and Figure 7. Using this two minima, the duration of the flat part of the secondary minimum is determined as 583 minutes. ...
Measuring Astronomical Distances
... allowed the telescope to observe a wider field of view This blind survey will get spectra for ~0.3 million galaxies in the SHELA field ...
... allowed the telescope to observe a wider field of view This blind survey will get spectra for ~0.3 million galaxies in the SHELA field ...
Galaxy5
... • To be a quasar or an AGN the black hole must be fed. It has to be accreting material. • This requires that gas or stars be sent into the immediate vicinity of the central massive black hole. • The way to accomplish this it to merge galaxies. This introduces new material to the central nucleus. • ...
... • To be a quasar or an AGN the black hole must be fed. It has to be accreting material. • This requires that gas or stars be sent into the immediate vicinity of the central massive black hole. • The way to accomplish this it to merge galaxies. This introduces new material to the central nucleus. • ...
Orion the Hunter
... No constellation dominates the winter sky like Orion the Hunter. Its brightest stars form one of the best known celestial shapes, which is visible even from cities. The plane of the Milky Way clips the northeast corner of the constellation and manifests itself as a featureless, hazy band through the ...
... No constellation dominates the winter sky like Orion the Hunter. Its brightest stars form one of the best known celestial shapes, which is visible even from cities. The plane of the Milky Way clips the northeast corner of the constellation and manifests itself as a featureless, hazy band through the ...
EarthComm_c1s9
... thirds of the way out on a spiral arm that stretches from the core of the galaxy. (Stellar means of or pertaining to stars.) The galaxy contains hundreds of billions of stars. Astronomers use a magnitude scale to describe the brightness of objects they see in the sky. A star’s brightness decreases w ...
... thirds of the way out on a spiral arm that stretches from the core of the galaxy. (Stellar means of or pertaining to stars.) The galaxy contains hundreds of billions of stars. Astronomers use a magnitude scale to describe the brightness of objects they see in the sky. A star’s brightness decreases w ...
Robert_Minchin_Galaxies_2011_REU
... Measuring Dynamics • Dynamics can be measured by looking at emission and absorption lines from stars and star-forming regions, or from the gas in the ISM. • Dynamics for spiral and irregular galaxies are often measured using the 21-cm line of neutral hydrogen. • For elliptical and spheroidal galaxi ...
... Measuring Dynamics • Dynamics can be measured by looking at emission and absorption lines from stars and star-forming regions, or from the gas in the ISM. • Dynamics for spiral and irregular galaxies are often measured using the 21-cm line of neutral hydrogen. • For elliptical and spheroidal galaxi ...
Constellation Classification Cards*
... numbers, e.g., Thuban = 3.65, are the dimmest stars. For Set B, there are six cards with three numbers. Stars with three numbers and a slash, e.g., Mintaka = 2.23 (3.2/3.3), are binary stars. Use the first number given for the combined brightness of the two stars when forming the graph. Stars with t ...
... numbers, e.g., Thuban = 3.65, are the dimmest stars. For Set B, there are six cards with three numbers. Stars with three numbers and a slash, e.g., Mintaka = 2.23 (3.2/3.3), are binary stars. Use the first number given for the combined brightness of the two stars when forming the graph. Stars with t ...
Classifying the Spectra of Stars:
... M-stars are very cool and typically have broad features. They usually have strong sodium but it’s broader than it is in a K star. M-stars are a complicated mess that often has very large areas of absorption due to molecules in their atmospheres. We will not be dealing with this spectral type. ...
... M-stars are very cool and typically have broad features. They usually have strong sodium but it’s broader than it is in a K star. M-stars are a complicated mess that often has very large areas of absorption due to molecules in their atmospheres. We will not be dealing with this spectral type. ...
PH607lec11-4gal2
... V(R (R) = V/R Angular velocity decreases with increasing radius Any feature in the disk will be wrapped into a trailing spiral pattern due to differential rotation. ...
... V(R (R) = V/R Angular velocity decreases with increasing radius Any feature in the disk will be wrapped into a trailing spiral pattern due to differential rotation. ...
slides - Indico
... Require large samples of, in particular, r-process-enhanced, metal-poor stars in order to place constraints on the nature of the r-process, its site(s), examination of possible variation in abundance patterns from star to star, and of course… ...
... Require large samples of, in particular, r-process-enhanced, metal-poor stars in order to place constraints on the nature of the r-process, its site(s), examination of possible variation in abundance patterns from star to star, and of course… ...
Luminosity - U of L Class Index
... • What are the two types of star clusters? Open clusters are loosely packed and contain up to a few thousand stars Globular clusters are densely packed and contain hundreds of thousands of stars ...
... • What are the two types of star clusters? Open clusters are loosely packed and contain up to a few thousand stars Globular clusters are densely packed and contain hundreds of thousands of stars ...
Astrophysics notes
... Extremely distant and old objects that emit more energy than a hundred galaxies combined. Produce emission spectra right across the EM spectrum, with the bulk lying within infrared wavelengths. ...
... Extremely distant and old objects that emit more energy than a hundred galaxies combined. Produce emission spectra right across the EM spectrum, with the bulk lying within infrared wavelengths. ...
Nearby Stars - How far away is it
... sky, along with its faint, white tiny stellar companion, Sirius B. The two stars revolve around each other every 50 years. [Additional info: Astronomers overexposed the image of Sirius A so that the dim Sirius B [tiny dot at lower left] could be seen.] 61-Cygni – 11.4 light years Here we have our fi ...
... sky, along with its faint, white tiny stellar companion, Sirius B. The two stars revolve around each other every 50 years. [Additional info: Astronomers overexposed the image of Sirius A so that the dim Sirius B [tiny dot at lower left] could be seen.] 61-Cygni – 11.4 light years Here we have our fi ...
THE PROPERTIES OF MAIN-SEQUENCE STARS - Cosmos
... V and actually lie within 100 pc. From this subsample we can determine the distribution in MV of mainsequence stars of given spectral type for spectral types that range from early F to early K. These distributions are signi cantly non-Gaussian, but when tted to Gaussians they yield central values o ...
... V and actually lie within 100 pc. From this subsample we can determine the distribution in MV of mainsequence stars of given spectral type for spectral types that range from early F to early K. These distributions are signi cantly non-Gaussian, but when tted to Gaussians they yield central values o ...
Variable star information
... Some stars are unstable and pulsate rhythmically, becoming larger and smaller in a periodic manner. These pulsations translate into a periodic variation of the light they emit. The most well known stars of this kind are Cepheid variables that have very stable pulsation periods. The changes in the ...
... Some stars are unstable and pulsate rhythmically, becoming larger and smaller in a periodic manner. These pulsations translate into a periodic variation of the light they emit. The most well known stars of this kind are Cepheid variables that have very stable pulsation periods. The changes in the ...
Aries (constellation)
Aries is one of the constellations of the zodiac. It is located in the northern celestial hemisphere between Pisces to the west and Taurus to the east. The name Aries is Latin for ram, and its symbol is 20px (Unicode ♈), representing a ram's horns. It is one of the 48 constellations described by the 2nd century astronomer Ptolemy, and remains one of the 88 modern constellations. It is a mid-sized constellation, ranking 39th overall size, with an area of 441 square degrees (1.1% of the celestial sphere).Although Aries came to represent specifically the ram whose fleece became the Golden Fleece of Ancient Greek mythology, it has represented a ram since late Babylonian times. Before that, the stars of Aries formed a farmhand. Different cultures have incorporated the stars of Aries into different constellations including twin inspectors in China and a porpoise in the Marshall Islands. Aries is a relatively dim constellation, possessing only four bright stars: Hamal (Alpha Arietis, second magnitude), Sheratan (Beta Arietis, third magnitude), Mesarthim (Gamma Arietis, fourth magnitude), and 41 Arietis (also fourth magnitude). The few deep-sky objects within the constellation are quite faint and include several pairs of interacting galaxies. Several meteor showers appear to radiate from Aries, including the Daytime Arietids and the Epsilon Arietids.