Vela X-1 Comparison Table

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physical object > natural object > celestial body > collection of stars > star system > binary star > close binary > eclipsing binary > Vela X-1

Next B star: Achernar Up: B star, eclipsing binary, single line spectroscopic binary, supergiant, X-ray source Previous B star: Spica

Vela X-1 comparison table

Subject has spectral type is part of has surface temperature is an instance of has velocity has surface density has optical brightness variation has parallax has observational problem has position on celestial sphere has color has absorption line has radiation at surface has abundance has energy source has energy production has catalog has wavelength is a kind of has material has mass has name designated with has observable variation time scale has synonym has definition has luminosity class has number of star

B star O, B, A, and early F 11000 to 28000 K determined from proper motion and radial velocity which depends on luminosity class from the point of view of Earth's orbit from the point of view of Earth blue-white He I which is diffused out from the hotter core gravitational contraction and or fusion which takes place primarily within the core star catalog early star hydrogen, helium greater than 0.08 the sun's mass Blue-white star of spectral type B whose spectra are characterized by absorption lines of neutral helium which reach their maximum intensity at B2. The Balmer lines of hydrogen are strong, and lines of singly ionized oxygen and other gases are also present.

eclipsing binary greater than 1000 Kelvin determined from proper motion and radial velocity which depends on luminosity class 0.2 magnitudes or greater from the point of view of Earth's orbit some difficulty in distinguishing between various kinds from the point of view of Earth which is diffused out from the hotter core half the stars in the solar neighborhood are members of star systems gravitational contraction and or fusion which takes place primarily within the core star catalog close binary hydrogen, helium greater than 0.08 the sun's mass
R, S, T, U, V, W, X, Y, or Z and the genitive of the latin constellation name
RR, RS, RT, RU, RV, RW, RX, RY, or RZ and the genitive of the latin constellation name when the single letter designations are exhausted
AA...AZ, BB...BZ, etc. (omitting J), which ends with QQ...QZ and the genitive of the latin constellation namewhen the RR...RZ designations are exhausted
V 335, V 336, etc., when the double letter designations are exhausted
within a period of decades Eclipsing variables whose orbital plane lies so nearly in the line of sight that eclipses, as seen from the Earth, can occur and can be detected from their light curves. 2

single line spectroscopic binary greater than 1000 Kelvin determined from proper motion and radial velocity which depends on luminosity class from the point of view of Earth's orbit from the point of view of Earth which is diffused out from the hotter core half the stars in the solar neighborhood are members of star systems gravitational contraction and or fusion which takes place primarily within the core star catalog spectroscopic binary hydrogen, helium greater than 0.08 the sun's mass a spectroscopic binary in which periodic Doppler shift is detected in only one component of the binary star 2

supergiant greater than 1000 Kelvin determined from proper motion and radial velocity which depends on luminosity class from the point of view of Earth's orbit from the point of view of Earth which is diffused out from the hotter core gravitational contraction and or fusion which takes place primarily within the core star catalog star hydrogen, helium greater than 0.08 the sun's mass An extremely luminous star of large diameter and low density. No supergiants are near enough to establish a trigonometric parallax. I

X-ray source celestial sphere X-ray celestial body A class of celestial objects whose dominant mechanism of energy dissipation is through X-ray emission. Galactic X-ray sources appear optically as starlike objects, peculiar in their ultraviolet intensity, variability (on time scales ranging from milliseconds to weeks), and spectral features. All known compact X-ray sources are members of close binary systems; a current popular model is mass accretion onto a compact object from a massive companion. (Four X-ray sources - all variable - are known to be associated with globular clusters.) The 21 known extended X-ray sources associated with clusters of galaxies seem to be clouds of hot gas trapped in the cluster's gravitational field.

Vela X-1 B0.5 Ib celestial sphere 11000 to 28000 K single line spectroscopic binary determined from proper motion and radial velocity which depends on luminosity class 0.2 magnitudes or greater from the point of view of Earth's orbit some difficulty in distinguishing between various kinds from the point of view of Earth blue-white He I which is diffused out from the hotter core half the stars in the solar neighborhood are members of star systems gravitational contraction and or fusion which takes place primarily within the core star catalog X-ray hydrogen, helium of unseen companion 1.7 to 15 M_sun, with a probable value of about 2.6 M_sun.
R, S, T, U, V, W, X, Y, or Z and the genitive of the latin constellation name
RR, RS, RT, RU, RV, RW, RX, RY, or RZ and the genitive of the latin constellation name when the single letter designations are exhausted
AA...AZ, BB...BZ, etc. (omitting J), which ends with QQ...QZ and the genitive of the latin constellation namewhen the RR...RZ designations are exhausted
V 335, V 336, etc., when the double letter designations are exhausted
within a period of decades 3U 0900-40 I 2

Next B star: Achernar Up: B star, eclipsing binary, single line spectroscopic binary, supergiant, X-ray source Previous B star: Spica

Subject	has spectral type	is part of	has surface temperature	is an instance of	has velocity	has surface density	has optical brightness variation	has parallax	has observational problem	has position on celestial sphere	has color	has absorption line	has radiation at surface	has abundance	has energy source	has energy production	has catalog	has wavelength	is a kind of	has material	has mass	has name designated with	has observable variation time scale	has synonym	has definition	has luminosity class	has number of star
B star	O, B, A, and early F		11000 to 28000 K		determined from proper motion and radial velocity	which depends on luminosity class		from the point of view of Earth's orbit		from the point of view of Earth	blue-white	He I	which is diffused out from the hotter core		gravitational contraction and or fusion	which takes place primarily within the core	star catalog		early star	hydrogen, helium	greater than 0.08 the sun's mass				Blue-white star of spectral type B whose spectra are characterized by absorption lines of neutral helium which reach their maximum intensity at B2. The Balmer lines of hydrogen are strong, and lines of singly ionized oxygen and other gases are also present.
eclipsing binary			greater than 1000 Kelvin		determined from proper motion and radial velocity	which depends on luminosity class	0.2 magnitudes or greater	from the point of view of Earth's orbit	some difficulty in distinguishing between various kinds	from the point of view of Earth			which is diffused out from the hotter core	half the stars in the solar neighborhood are members of star systems	gravitational contraction and or fusion	which takes place primarily within the core	star catalog		close binary	hydrogen, helium	greater than 0.08 the sun's mass	R, S, T, U, V, W, X, Y, or Z and the genitive of the latin constellation name RR, RS, RT, RU, RV, RW, RX, RY, or RZ and the genitive of the latin constellation name when the single letter designations are exhausted AA...AZ, BB...BZ, etc. (omitting J), which ends with QQ...QZ and the genitive of the latin constellation namewhen the RR...RZ designations are exhausted V 335, V 336, etc., when the double letter designations are exhausted	within a period of decades		Eclipsing variables whose orbital plane lies so nearly in the line of sight that eclipses, as seen from the Earth, can occur and can be detected from their light curves.		2
single line spectroscopic binary			greater than 1000 Kelvin		determined from proper motion and radial velocity	which depends on luminosity class		from the point of view of Earth's orbit		from the point of view of Earth			which is diffused out from the hotter core	half the stars in the solar neighborhood are members of star systems	gravitational contraction and or fusion	which takes place primarily within the core	star catalog		spectroscopic binary	hydrogen, helium	greater than 0.08 the sun's mass				a spectroscopic binary in which periodic Doppler shift is detected in only one component of the binary star		2
supergiant			greater than 1000 Kelvin		determined from proper motion and radial velocity	which depends on luminosity class		from the point of view of Earth's orbit		from the point of view of Earth			which is diffused out from the hotter core		gravitational contraction and or fusion	which takes place primarily within the core	star catalog		star	hydrogen, helium	greater than 0.08 the sun's mass				An extremely luminous star of large diameter and low density. No supergiants are near enough to establish a trigonometric parallax.	I
X-ray source		celestial sphere																X-ray	celestial body						A class of celestial objects whose dominant mechanism of energy dissipation is through X-ray emission. Galactic X-ray sources appear optically as starlike objects, peculiar in their ultraviolet intensity, variability (on time scales ranging from milliseconds to weeks), and spectral features. All known compact X-ray sources are members of close binary systems; a current popular model is mass accretion onto a compact object from a massive companion. (Four X-ray sources - all variable - are known to be associated with globular clusters.) The 21 known extended X-ray sources associated with clusters of galaxies seem to be clouds of hot gas trapped in the cluster's gravitational field.
Vela X-1	B0.5 Ib	celestial sphere	11000 to 28000 K	single line spectroscopic binary	determined from proper motion and radial velocity	which depends on luminosity class	0.2 magnitudes or greater	from the point of view of Earth's orbit	some difficulty in distinguishing between various kinds	from the point of view of Earth	blue-white	He I	which is diffused out from the hotter core	half the stars in the solar neighborhood are members of star systems	gravitational contraction and or fusion	which takes place primarily within the core	star catalog	X-ray		hydrogen, helium	of unseen companion 1.7 to 15 M_sun, with a probable value of about 2.6 M_sun.	R, S, T, U, V, W, X, Y, or Z and the genitive of the latin constellation name RR, RS, RT, RU, RV, RW, RX, RY, or RZ and the genitive of the latin constellation name when the single letter designations are exhausted AA...AZ, BB...BZ, etc. (omitting J), which ends with QQ...QZ and the genitive of the latin constellation namewhen the RR...RZ designations are exhausted V 335, V 336, etc., when the double letter designations are exhausted	within a period of decades	3U 0900-40		I	2