Population I star Comparison Table

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Population I star comparison table

Subject has rotational period at pole has spectral type has age has surface temperature is an instance of has velocity has galactic orbital period has velocity relative to nearby star has optical brightness variation has mean density has density at surface has rotational period at equator has luminosity has observational problem has light curve has inclination of rotational axis to pole of ecliptic has color has distance from galactic plane has radiu has symbol has distance from galactic center has absolute bolometric magnitude has central density has galactic orbital velocity has prototype has absolute visual magnitude has period has amplitude has energy source has surface gravity has energy generating mass has absolute magnitude has magnetic field is a kind of has apparent magnitude has material has mass has name designated with has mean rotation spe has observable variation time scale has synonym has definition has luminosity class has escape velocity has central temperature

Population I Cepheid F star, G star and K star greater than 1000 Kelvin determined from proper motion and radial velocity 0.2 magnitudes or greater some difficulty in distinguishing between various kinds delta Cephei 5-10 days gravitational contraction and or fusion <M_v> = -0.5 to -6 Population I star 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 young disk Cepheid A Cepheid which is about 4 times more luminous than Population II Cepheids, probably because of their higher metal content (although mass may also be a factor).

Sun 35 days G2 4.6 billion years 5785 K naked eye object 220 million years (e ≈ 0) 20 km s^-1 toward R.A. 18^h4^m, declination +30° (towards in Hercules) 1.409 g cm^-3 3 × 10^-7 g cm^-3 24^d6^h 3.83 × 10³³ ergs s^-1 7°15' yellowish 35 light-years 695990 km d 27000 light-years M_bol = +4.67 155 g cm^-3 (Bahcall 1973) V_orb = 250-300 km s^-1 M_v = +4.85 proton-proton reaction 27398 cm s^-2 0.35 M_sun 1-2 gauss as high as 10-1000 gauss in active regions -26.74 1.989 × 10³³ g 1.9 km s^-1 disk star Star that Earth orbits. Central body of solar system. It takes about 1-10 million years for photons to diffuse from the Sun's interior to its surface. About 3% of the energy radiated is in the form of neutrinos. Every second about 655 million tons of H are being converted into 650 million tons of He. A grazing light ray is deflected 1".7 by the Sun. If the total angular momentum of the solar system were concentrated in the Sun, its equatorial rotation speed would be about 100 km s^-1. V (main-sequence) V_esc = 618 km s^-1 14-15 × 10⁶ K

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Subject	has rotational period at pole	has spectral type	has age	has surface temperature	is an instance of	has velocity	has galactic orbital period	has velocity relative to nearby star	has optical brightness variation	has mean density	has density at surface	has rotational period at equator	has luminosity	has observational problem	has light curve	has inclination of rotational axis to pole of ecliptic	has color	has distance from galactic plane	has radiu	has symbol	has distance from galactic center	has absolute bolometric magnitude	has central density	has galactic orbital velocity	has prototype	has absolute visual magnitude	has period	has amplitude	has energy source	has surface gravity	has energy generating mass	has absolute magnitude	has magnetic field	is a kind of	has apparent magnitude	has material	has mass	has name designated with	has mean rotation spe	has observable variation time scale	has synonym	has definition	has luminosity class	has escape velocity	has central temperature
Population I Cepheid		F star, G star and K star		greater than 1000 Kelvin		determined from proper motion and radial velocity			0.2 magnitudes or greater					some difficulty in distinguishing between various kinds											delta Cephei		5-10 days		gravitational contraction and or fusion			<M_v> = -0.5 to -6		Population I star		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	young disk Cepheid	A Cepheid which is about 4 times more luminous than Population II Cepheids, probably because of their higher metal content (although mass may also be a factor).
Sun	35 days	G2	4.6 billion years	5785 K	naked eye object		220 million years (e ≈ 0)	20 km s^-1 toward R.A. 18^h4^m, declination +30° (towards in Hercules)		1.409 g cm^-3	3 × 10^-7 g cm^-3	24^d6^h	3.83 × 10³³ ergs s^-1			7°15'	yellowish	35 light-years	695990 km	d	27000 light-years	M_bol = +4.67	155 g cm^-3 (Bahcall 1973)	V_orb = 250-300 km s^-1		M_v = +4.85			proton-proton reaction	27398 cm s^-2	0.35 M_sun		1-2 gauss as high as 10-1000 gauss in active regions		-26.74		1.989 × 10³³ g		1.9 km s^-1		disk star	Star that Earth orbits. Central body of solar system. It takes about 1-10 million years for photons to diffuse from the Sun's interior to its surface. About 3% of the energy radiated is in the form of neutrinos. Every second about 655 million tons of H are being converted into 650 million tons of He. A grazing light ray is deflected 1".7 by the Sun. If the total angular momentum of the solar system were concentrated in the Sun, its equatorial rotation speed would be about 100 km s^-1.	V (main-sequence)	V_esc = 618 km s^-1	14-15 × 10⁶ K