An interesting nebular object in LDN 288
... For the preceding two stars the mean distance module will be DM (mean) = 7m.884 and hence the corresponding mean distance will be r(mean) = 380 pc. This means that the distance to the cloud LDN 288 will be greater than or equal to 380 pc. In [9] a new method of estimation of the distance to an unsta ...
... For the preceding two stars the mean distance module will be DM (mean) = 7m.884 and hence the corresponding mean distance will be r(mean) = 380 pc. This means that the distance to the cloud LDN 288 will be greater than or equal to 380 pc. In [9] a new method of estimation of the distance to an unsta ...
Pretty Pictures of the Cosmos
... bubble, blown by winds from the brightest star visible within the bubble's boundary. The bubble's expansion is constrained by the surrounding material. About 10 light-years in diameter, if the Bubble nebula were centered on the Sun, the Sun's nearest stellar neighbor, Alpha Centauri, would also be e ...
... bubble, blown by winds from the brightest star visible within the bubble's boundary. The bubble's expansion is constrained by the surrounding material. About 10 light-years in diameter, if the Bubble nebula were centered on the Sun, the Sun's nearest stellar neighbor, Alpha Centauri, would also be e ...
Common Envelope Evolution Leading to Supernovae with Dense
... interaction, but only ones with a circumstellar extent greater than the radius at which radiation can diffuse out have Type IIn characteristics. The mass loss involved can be & 10M and extends to & 2 × 1015 cm for Type IIn characteristics (see also Smith & McCray 2007). To account for such high mas ...
... interaction, but only ones with a circumstellar extent greater than the radius at which radiation can diffuse out have Type IIn characteristics. The mass loss involved can be & 10M and extends to & 2 × 1015 cm for Type IIn characteristics (see also Smith & McCray 2007). To account for such high mas ...
Pattern recognition of star constellations for spacecraft
... A star is only detected if the magnitude is above a given threshold level compared to the noise. Due to the uncertainty of the magnitude one cannot determine whether a star is above or below the threshold and hence if it will be registered. The uncertainty of the stellar magnitude is being included ...
... A star is only detected if the magnitude is above a given threshold level compared to the noise. Due to the uncertainty of the magnitude one cannot determine whether a star is above or below the threshold and hence if it will be registered. The uncertainty of the stellar magnitude is being included ...
Stellar Structure and Evolution II
... • After core helium fusion stops, He fuses into carbon in a shell around the carbon core, and H fuses to He in a shell around the helium layer • This double-shell burning stage never reaches equilibrium—fusion rate periodically spikes upward in a series of thermal pulses ...
... • After core helium fusion stops, He fuses into carbon in a shell around the carbon core, and H fuses to He in a shell around the helium layer • This double-shell burning stage never reaches equilibrium—fusion rate periodically spikes upward in a series of thermal pulses ...
When Stars Attack! In Search of Killer Supernovae
... noticed that a new and unusual star, surpassing the other stars in brilliancy, was shining ... and since I had, from boyhood, known all the stars of the heavens perfectly, it was quite evident to me that there had never been any star in that place of the sky ... I was so astonished of this sight ... ...
... noticed that a new and unusual star, surpassing the other stars in brilliancy, was shining ... and since I had, from boyhood, known all the stars of the heavens perfectly, it was quite evident to me that there had never been any star in that place of the sky ... I was so astonished of this sight ... ...
Chapter 12 Stellar Evolution
... straight line; it stays at just about the same luminosity as it cools off. • Eventually, the star dies in a violent explosion called a supernova. ...
... straight line; it stays at just about the same luminosity as it cools off. • Eventually, the star dies in a violent explosion called a supernova. ...
Progenitor and environment of the peculiar red nova V838 Mon
... At that time the main part of stellar mass is exposed to push for the radial and almost adiabatic expansion and cools down as a result. When the radiation and shock wave of the explosion come out to the star surface, its area turns out to be so large that it cannot be heated up to high temperature, ...
... At that time the main part of stellar mass is exposed to push for the radial and almost adiabatic expansion and cools down as a result. When the radiation and shock wave of the explosion come out to the star surface, its area turns out to be so large that it cannot be heated up to high temperature, ...
SkyWatcher - Boise Astronomical Society
... Candlemas, or Groundhog Day occurs today; Uranus is 3 degrees north of the Moon 2/3 Asteroid 1 Ceres (magnitude +8.9) is 1 degree south of the Moon in Pisces. The Lunar X (the Purbach or Werner Cross), an X-shaped Clair-obscure illumination effect involving various rims and ridges between the crater ...
... Candlemas, or Groundhog Day occurs today; Uranus is 3 degrees north of the Moon 2/3 Asteroid 1 Ceres (magnitude +8.9) is 1 degree south of the Moon in Pisces. The Lunar X (the Purbach or Werner Cross), an X-shaped Clair-obscure illumination effect involving various rims and ridges between the crater ...
SN 1054
SN 1054 is a supernova that was first observed on 4 July 1054 A.D. (hence its name), and that lasted for a period of around two years. The event was recorded in contemporary Chinese astronomy, and references to it are also found in a later (13th-century) Japanese document, and in a document from the Arab world. Furthermore, there are a number of proposed, but doubtful, references from European sources recorded in the 15th century, and perhaps a pictograph associated with the Ancestral Puebloan culture found near the Peñasco Blanco site in New Mexico.The remnant of SN 1054, which consists of debris ejected during the explosion, is known as the Crab Nebula. It is located in the sky near the star Zeta Tauri (ζ Tauri). The core of the exploding star formed a pulsar, called the Crab Pulsar (or PSR B0531+21). The nebula and the pulsar it contains are the most studied astronomical objects outside the Solar System. It is one of the few Galactic supernovae where the date of the explosion is well known. The two objects are the most luminous in their respective categories. For these reasons, and because of the important role it has repeatedly played in the modern era, SN 1054 is the best known supernova in the history of astronomy.The Crab Nebula is easily observed by amateur astronomers thanks to its brightness, and was also catalogued early on by professional astronomers, long before its true nature was understood and identified. When the French astronomer Charles Messier watched for the return of Halley's Comet in 1758, he confused the nebula for the comet, as he was unaware of the former's existence. Due to this error, he created his catalogue of non-cometary nebulous objects, the Messier Catalogue, to avoid such mistakes in the future. The nebula is catalogued as the first Messier object, or M1.