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Corrections, additions, and clarifications to the (2016) 2nd Edition.

Last update: May 23, 2016

p. 81, in equation for initial-final mass relation, missing M_\odot after 0.39.

p. 91, at the end of the section add: (see section 5.4.6)

p. 111, Chapter 4, Problem 4e., change velocity v=10^4 km/s to 3x10^4 km/s.

p. 138, the collision cross-section for electrons and protons is \sigma~10^{-13} cm^2, rather than 10^{-15} cm^2.

p. 156, Chapter 5, Problem 6a., Answers: should be B=30 micro-Gauss, rather than 70 micro-Gauss, which is 10-20 times higher (rather than 20-30 times) than typical ISM fields.

p. 160, 2nd line, redundant "can be estimated as follows".

p. 224, Fig. 8.6, replace with improved Fig. 7.6 from the 1st edition.

p. 278, in website link for the book at Princeton University Press, change 8457 to 10772.

Corrections, additions, and clarifications to the (2007) 1st Edition.

Entries in white were corrected in the 1st Edition's 2nd printing, August 2008.

Entries in red and

in yellow have been corrected in the 2016 2nd Edition.

Last update: February 14, 2016

p. xv, constants and units, Planck's constant, $\bar h$, change 1.1 to 1.05 (for improved accuracy, since this constant is close to 1).

p. 2 Fig. 1.1 caption. E --> $E$

p. 6 \nu=\lambda/c --> \nu=c/\lambda

p. 12 Eq. 2.5 For clarity, replace integral with double-integral sign, with first integration from \phi=0 to 2\pi, and replace d\Omega with sin\theta d\theta d\phi.

p. 18 add footnote on air vs. vacuum wavelengths:

\footnote{As customary in the astronomical research literature, wavelengths of atomic transitions are cited to four significant digits, as measured {\it in air} at standard temperature and pressure. Since the speed of light is smaller in air than in vacuum, the wavelengths in vacuum are longer by a factor equal to the index of refraction of air, $1.00028$ for optical light.}

p. 26 put extrasolar planets in {\bf}

p. 30 Answers to Problem 4: all masses need to be scaled up by a factor of 10.

p. 41, Eq. 3.53, and line below it: missing space between "erg" and "s^{-1}".

p. 48 rephrasing of Kelvin Helmholz argument: replace:

"Therefore, the thermal energy that results from the contraction, and which the Sun can radiate is" with -->

"Therefore, the other half of the gravitational energy released by the contraction, and which the Sun could have radiated, is"

Eq. 3.95, replace E_th with E_rad.

"how long the Sun could shine..." -- > "how long the sun could have shined..."

p. 56, Eq. 3.138, 35.5 MeV should be 32.9 MeV. Eq. 3.139 needs to be corrected accordingly, and the result is then exp(-44) instead of exp(-46).

p. 61, Problem 1, missing minus sign in what should be $E_{\rm gr}=-E_{\rm th}^{\rm tot} .

p. 62, Problem 6b, answer should be 0.70 r_\odot (assuming a mean particle mass of 0.61 m_H for solar abundances -- see Eq. 3.73).

p. 63, Problem 8, in expression for \beta, missing power 1/3 on first term; should read: $\beta=\left(\frac{E_G}{4kT_0}\right)^{1/3}-\frac{2}{3}$.

p. 72 assymptotic --> asymptotic

p. 72 , and fig. 4.4 caption, occupation fraction --> occupation number

p. 74 end of footnote: U/3 --> u/3

p. 75 dynes --> dyne

p. 79 Eq. 4.55 Planck-constant units should be erg s rather than erg/s, and final result should be 10^-7 erg rather than 10^-8.

p. 81, Eq. 4.61, (Z/A) should be to the power 5/4, rather than 5/3.

p. 84, Eq. 4.77, 14 km should be 11 km.

p. 85 unable to reproduce the "explosion" --> unable to reproduce all the properties of the observed "explosion".

p, 89 Fig. 4.9 right-hand border of figure missing.

p. 91 {\bf grow} --> {\it grow}

p. 94 Next to last line: on nuclear matter -- > of nuclear matter

p. 94 add footnote on Crab initial \tau_i: \footnote{The so-called {\it braking index}, which equals 3 in Eq.~\ref{omegadot} for the case of a magnetic dipole, has actually been measured directly for several pulsars, and is sometimes less than 3. Such is the case for the Crab pulsar, and its deduced initial spin period is then actually 19~ms.}

p. 102 rewording of footnote on angular momentum conservation in accretion disks: \footnote{Note that, in addition to energy conservation, a full treatment of accretion disk structure must also conserve angular momentum. The angular momentum per unit mass of a disk particle at radius $r$, in a circular Keplerian orbit with velocity $v_c$, is $J/m=r v_c={\sqrt{GMr}}$. Thus, a particle descending to an orbit at smaller $r$ must get rid of angular momentum by transfering it outward to other particles in the disk via viscous torques. Some particles at the outer edge of the disk must therefore gain angular momentum, and hence move to larger radii. Some of the gravitational energy released by the inflow will power this outflow of matter, at the expense of the energy that can be radiated by the disk. The work done by the frictional torques also increases by a factor of $\approx 3$ the thermal energies in the outer radii of the disk, at the expense of the inner radii, slightly modifying Eq.~\ref{disktempprof}. The exact form will depend also on the amount of angular momentum transfered to the accreting object at the inner edge of the disk.}

p. 106 Eq. 4.142, Eddington Luminosity should be 3.3x10^4 L_{\odot}, instead of 6.5x10^4 L_{\odot}.

p. 109 Problem 3b., add space between \sqrt N and l, to make clear that l is not under the square root sign

p. 111, answer to Problem 7b., change to 1.6\times 10^8 M_{\odot}

p. 118 Last sentence before Eq. 5.13, before "the gravitational energy", add "minus the other half of". Eq. 5.13, add factor 1/2 on the left side. Eq. 5.15, delete factor 1/2 on the right side. As a consequence, results should be doubled in Eqns. 5.16 and 5.17, and halved in 5.19.

p. 126 Move definition of LTE to p. 128, to a new footnote, after "...but not necessarily between mass particles and radiation.", explaining the different definition of LTE in the context of stellar structure: "In the context of the physics of diffuse interstellar gas, this situation is called 'local thermodynamic equilibrium'. Note that in other contexts, this term sometime has a different definition. For example, in the context of stellar structure, LTE refers to a situation in which the temperature may vary with location in the star, yet at a particular location there is thermodynamic equilibrium, including a radiation field with a Planck spectrum that corresponds to the local kinetic (Maxwellian) temperature."

p. 139 Add note at end of Problem 3: Note: Actual measurements indicate that the secondaries in binaries are {\bf not} drawn from a Salpeter mass function, but rather from a mass distribution that is approximately flat. Also, the measured binary separation distribution is not flat, as assumed in this problem, but rather flat in logarithmic intervals (or, equivalently, $dN/da\propto 1/a$, where $a$ is the separation)

p. 154 2nd sentence, delete 2nd "is"; {\bf Einstein radius} --> Einstein angle (no boldface)

p. 159 Einstein radius --> Einstein angle

p. 164 galaxy types it that ellipticals --> galaxy types is that ellipticals

p. 172 Einstein radius --> {\bf Einstein radius}

p. 175 Problem 1: Capitalize "Galaxy"

p. 176, Problem 4, Eintein should be Einstein.

p. 177 Problem 6b., answer should be 3.1\times 10^{-5}

p. 180 add footnote on Cepheid parallaxes: \footnote{About a dozen Cepheids are near enough to permit direct parallax measurements. These measurements confirm the calibration of the period-luminosity relation.}

p. 183 NGC 4258 Fig. 7.4 caption, change: emission from the active nucleus of the galaxy and from the inner parts of its jet are also indicated. --> emission from the inner parts of the jet, emerging from the active nucleus of the galaxy, is also indicated.

p. 186 Fig. 7.6, replace with updated Hubble diagram, reference S. Jha, A. Riess, and R. Kirshner, 2007, Astrophys. J., 659, 122

p. 193, below 8.16, Eintein should be Einstein.

p. 194 Eqns. 8.18-8.21, change notation from R to {\cal R} for Riemann tensor, Ricci tensor, and Ricci scalar, to distinguish them from the scale factor R.

p. 194 Eq. 8.22, numerator of expression for G_{11}, k should be kc^2

p. 231 Problem 4: photon flux --> energy flux

p. 232 Problem 8c: 13.7 -- > 14

p. 233 Problem 9: a is the Stefan-Boltzmann --> $a$ is the Stefan-Boltzmann

p. 233 Problem 11b: 13.7 --> 14

p. 242 Index, remove redundant entry of "energy-momentum tensor".