Selene (pronounced se-LEE-nee) means "moon" in Greek and is the name of the goddess of the moon in Greek mythology.  The Latinized form is Selena.  "Selina" could be considered a misspelling or simply an Anglicized version.  Germans often used Latin names, or Latin forms of otherwise German names (e.g., Adolphus for Adolf), sometimes as a sign of being educated (i.e., literate).

1.  Marriage Records:

2.  1850 Census Index/Images (online at Ancestry.com; Image #104 of 201 — indexed "Straw"):  Division No. 73, Richmond Co., GA, Roll M432_81, p. 491B, 784/___, enumerated 4 Oct 1850, official enumeration date 1 Jun 1850 (extracted by Diana Gale Matthiesen):¤•

Peter Straub	39	M		Shop Keeper	2000	Germany
Selina   "	40	F				"
Clara    "	8	F				Ga
Charles Kuttoff	20	M		Bar Keeper		Germany

3.  1860 Census Index/Images (online at Ancestry.com; Image #155 of 334):  Augusta P.O., City of Augusta (Ward 4), Richmond Co., GA, Roll M653-135, p. 859, PN 155/859, 1288/1258, enumerated 18 Aug 1860, official enumeration date 1 Jun 1860 (extracted by Diana Gale Matthiesen):¤•

Peter Straub	50	M		Ginger Pop		250	Baden
Barbary  "	49	F					"
Christian Menzer	21	M		Blk Smith			"
William     "	20	M		Coach Maker			Ga
Julia       "	15	F					"
Amelia      "	13	F					"
Samuel      "	11	M					"
John        "	9	M					"
Josephine   "	7	F					"

"Ginger Pop" was a soft drink, what we'd call "soda pop."  The MENZERs are Barbara's children from a former marriage.

4.  Augusta Unit, Federal Writers' Project in Georgia, Works Progress Administration.  1938.  Augusta.  Sponsored by City Council of Augusta.  Publ. by Tidwell Print. Supply Co., Augusta, GA (online at HeritageQuest at Genealogy.com):

p. 197	THE POETIC PRESS A naive habit of ealy Augustans was that of versifying in public print...
p. 198	In 1851 Peter Straub's "Dutchman's Balls" were poetically advertised in the newspapers: A BALL FOR THE B'HOYS At Peter Straub's on Thursday evening next, at 8 o'clock. What Though cotton's price be down, And speculators all o'er town Hold down their heads and wear a frown   Dolefully? Say, shall the boys of the right sort Debar themselves of every sport, Screw up their faces and grin and snort   Awfully? No! Every B'hoy answers, no! And swears to Peter Straub's he'll go And trip the light fantastic toe At his ballroom near the    Factory. A later verse expreses the hosts's regrets:
p. 199	BALL POSTPONED The frowning heavens that o'er us lower, The drenching rains that round us shower, The streets so muddy and so wet, Your looks so full of sad regret, Bid me my frolic to postpone Until another week is gone, When, wishing streets and weather dry, To please you then, my best I'll try. On Thursday 10th I hope you all Will patronize THE DUTCHMAN'S BALL.

5.  WorldConnect / Ancestry World Trees (online at RootsWeb.com/Ancestry.com).

6.  Messages in several fora online at GenForum.com (a search from the Genealogy.com home page will pick them up).